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ZSI_Reconnect_China/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-H03F.xml

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<?xml version="1.0" encoding="UTF-8"?>
<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="H03F" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>H03F</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>AMPLIFIERS </text><reference><text>measuring, testing <class-ref scheme="cpc">G01R</class-ref>; optical parametric amplifiers <class-ref scheme="cpc">G02F</class-ref>; circuit arrangement with secondary emission tubes <class-ref scheme="cpc">H01J43/30</class-ref>; masers, lasers <class-ref scheme="cpc">H01S</class-ref>; control of amplification <class-ref scheme="cpc">H03G</class-ref>; coupling arrangements independent of the nature of the amplifiers, voltage dividers <class-ref scheme="cpc">H03H</class-ref>; amplifiers capable only of dealing with pulses <class-ref scheme="cpc">H03K</class-ref>; repeater circuits in transmission lines <class-ref scheme="cpc">H04B3/36</class-ref>, <class-ref scheme="cpc">H04B3/58</class-ref>; application of speech amplifiers in telephonic communication <class-ref scheme="cpc">H04M1/60</class-ref>, <class-ref scheme="cpc">H04M3/40</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u>: <subnote type="bullet"><note-paragraph>linear amplification, there being linear relationship between the amplitudes of input and output, and the output having substantially the same waveform as the input; </note-paragraph><note-paragraph>dielectric amplifiers, magnetic amplifiers, and parametric amplifiers when used as oscillators or frequency-changers; </note-paragraph><note-paragraph>constructions of active elements of dielectric amplifiers and parametric amplifiers if no provision exists elsewhere.</note-paragraph></subnote></note-paragraph></note><note type="warning"><note-paragraph warning-type="ipc-not-used">The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups: <table><row><entry><class-ref scheme="ipc">H03F1/44</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">H03F1/42</class-ref></entry></row><row><entry><class-ref scheme="ipc">H03F1/46</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">H03F1/42</class-ref></entry></row><row><entry><class-ref scheme="ipc">H03F3/18</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">H03F3/00</class-ref></entry></row><row><entry><class-ref scheme="ipc">H03F3/32</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">H03F3/30</class-ref></entry></row><row><entry><class-ref scheme="ipc">H03F7/06</class-ref></entry><entry> covered by </entry><entry><class-ref scheme="cpc">H03F7/00</class-ref></entry></row></table></note-paragraph><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H03F1/00" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/00</classification-symbol>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F1/00" definition-exists="true" ipc-concordant="H03F1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F1/02" definition-exists="true" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/0205" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in transistor amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0211" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with control of the supply voltage or current</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/0216" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Continuous control</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F1/0222" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the input signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F1/0227" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using supply converters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F1/0233" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0233</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the output signal, e.g. bootstrapping the voltage supply</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F1/0238" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0238</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using supply converters</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/0244" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0244</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stepped control</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F1/025" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the input signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F1/0255" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0255</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the output signal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0261" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0261</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with control of the polarisation voltage or current, e.g. gliding Class A</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/0266" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0266</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the input signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/0272" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0272</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a signal derived from the output signal</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0277" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0277</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selecting one or more amplifiers from a plurality of amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0283" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0283</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reducing the number of Dc-current paths</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0288" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0288</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/0294" definition-exists="false" ipc-concordant="H03F1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/0294</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using vector summing of two or more constant amplitude phase-modulated signals</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/04" definition-exists="false" ipc-concordant="H03F1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge-tube amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/06" definition-exists="false" ipc-concordant="H03F1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>to raise the efficiency of amplifying modulated radio frequency waves</text></title-part><title-part><text>to raise the efficiency of amplifiers acting also as modulators </text><CPC-specific-text><reference><text>modulation <class-ref scheme="cpc">H03C</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/07" definition-exists="false" ipc-concordant="H03F1/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Doherty-type amplifiers</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F1/08" definition-exists="true" ipc-concordant="H03F1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03F1/08</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements </text><reference><text>wide-band amplifiers with inter-stage coupling networks incorporating these impedances <class-ref scheme="cpc">H03F1/42</class-ref>; eliminating transit-time effects in vacuum tubes <class-ref scheme="cpc">H01J21/34</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/083" definition-exists="false" ipc-concordant="H03F1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03F1/083</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>in transistor amplifiers </text><reference><text><class-ref scheme="cpc">H03F1/10</class-ref>&#160;-&#160;<class-ref scheme="cpc">H03F1/22</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/086" definition-exists="false" ipc-concordant="H03F1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/10" definition-exists="false" ipc-concordant="H03F1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by use of amplifying elements with multiple electrode connections</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/12" definition-exists="false" ipc-concordant="H03F1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by use of attenuating means </text><CPC-specific-text><reference><text>attenuators <class-ref scheme="cpc">H03G</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/13" definition-exists="false" ipc-concordant="H03F1/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge tube amplifiers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/14" definition-exists="false" ipc-concordant="H03F1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by use of neutralising means</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/16" definition-exists="false" ipc-concordant="H03F1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge tube amplifiers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/18" definition-exists="false" ipc-concordant="H03F1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03F1/18</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>by use of distributed coupling </text><CPC-specific-text><text>, i.e. distributed amplifiers </text><reference><text>distributed amplifiers using coupling networks with distributed constants <class-ref scheme="cpc">H03F3/605</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/20" definition-exists="false" ipc-concordant="H03F1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge-tube amplifiers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/22" definition-exists="false" ipc-concordant="H03F1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/223" definition-exists="false" ipc-concordant="H03F1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with MOSFET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/226" definition-exists="false" ipc-concordant="H03F1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/24" definition-exists="false" ipc-concordant="H03F1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge-tube amplifiers</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F1/26" definition-exists="true" ipc-concordant="H03F1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of amplifiers to reduce influence of noise generated by amplifying elements</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/28" definition-exists="false" ipc-concordant="H03F1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in discharge-tube amplifiers </text><CPC-specific-text><reference><text>constructional modifications <class-ref scheme="cpc">H01J23/11</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F1/30" definition-exists="true" ipc-concordant="H03F1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of amplifiers to reduce influence of variations of temperature or supply voltage </text><CPC-specific-text><text>or other physical parameters </text><reference><text>in differential amplifiers <class-ref scheme="cpc">H03F3/45479</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F1/327" definition-exists="false" ipc-concordant="H03F1/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/327</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>to emulate discharge tube amplifier characteristics</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/3276" definition-exists="false" ipc-concordant="H03F1/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/3276</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using the nonlinearity inherent to components, e.g. a diode</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/342" definition-exists="false" ipc-concordant="H03F1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/342</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in field-effect transistor amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/523" definition-exists="false" ipc-concordant="H03F1/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/523</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for amplifiers using field-effect devices </text><reference><text><class-ref scheme="cpc">H03F1/526</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/526" definition-exists="false" ipc-concordant="H03F1/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F1/526</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>protecting by using redundant amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/54" definition-exists="false" ipc-concordant="H03F1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only </text><CPC-specific-text><reference><text>testing of vacuum tubes <class-ref scheme="cpc">G01R31/25</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/542" definition-exists="false" ipc-concordant="H03F1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/542</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Replacing by standby devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/544" definition-exists="false" ipc-concordant="H03F1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/544</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of filaments</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/546" definition-exists="false" ipc-concordant="H03F1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/546</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Delaying application of anode power supply with respect to application of filament heating power supply</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F1/548" definition-exists="false" ipc-concordant="H03F1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/548</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of anode or grid circuit against overload</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F1/56" definition-exists="true" ipc-concordant="H03F1/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of input or output impedances, not otherwise provided for</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F1/565" definition-exists="false" ipc-concordant="H03F1/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F1/565</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using inductive elements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F3/00" definition-exists="true" ipc-concordant="H03F3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H03F3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements</text></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph>Groups <class-ref scheme="cpc">H03F3/20</class-ref> - <class-ref scheme="cpc">H03F3/72</class-ref> take precedence over groups <class-ref scheme="cpc">H03F3/02</class-ref> - <class-ref scheme="cpc">H03F3/189</class-ref>.<br/><CPC-specific-note>This Note corresponds to IPC Note (1) relating to <class-ref scheme="cpc">H03F3/02</class-ref> - <class-ref scheme="cpc">H03F3/189</class-ref>.</CPC-specific-note></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/005" definition-exists="true" ipc-concordant="H03F3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H03F3/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/45</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/02" definition-exists="true" ipc-concordant="H03F3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only </text><reference><text>subsequent sub-groups take precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/04" definition-exists="false" ipc-concordant="H03F3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only </text><reference><text>subsequent sub-groups take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/06" definition-exists="false" ipc-concordant="H03F3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using hole storage effect</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/08" definition-exists="true" ipc-concordant="H03F3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>controlled by light</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/082" definition-exists="true" ipc-concordant="H03F3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with FET&apos;s </text><reference><text><class-ref scheme="cpc">H03F3/085</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/085" definition-exists="true" ipc-concordant="H03F3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using opto-couplers between stages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/087" definition-exists="true" ipc-concordant="H03F3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with IC amplifier blocks </text><reference><text><class-ref scheme="cpc">H03F3/085</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/10" definition-exists="true" ipc-concordant="H03F3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with diodes </text><CPC-specific-text><reference><text>parametric amplifiers <class-ref scheme="cpc">H03F7/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/12" definition-exists="true" ipc-concordant="H03F3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with Esaki diodes</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/14" definition-exists="true" ipc-concordant="H03F3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with amplifying devices having more than three electrodes or more than two PN junctions</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/16" definition-exists="true" ipc-concordant="H03F3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with field-effect devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/165" definition-exists="true" ipc-concordant="H03F3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/181" definition-exists="true" ipc-concordant="H03F3/181" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/181</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Low frequency amplifiers, e.g. audio preamplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/183" definition-exists="false" ipc-concordant="H03F3/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/183</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/185" definition-exists="false" ipc-concordant="H03F3/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with field-effect devices </text><reference><text><class-ref scheme="cpc">H03F3/187</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/1855" definition-exists="false" ipc-concordant="H03F3/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/1855</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/187" definition-exists="false" ipc-concordant="H03F3/187" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/187</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in integrated circuits</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/189" definition-exists="true" ipc-concordant="H03F3/189" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/189</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>High frequency amplifiers, e.g. radio frequency amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/19" definition-exists="false" ipc-concordant="H03F3/19" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/19</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/191" definition-exists="false" ipc-concordant="H03F3/191" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/191</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tuned amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/193</class-ref>, <class-ref scheme="cpc">H03F3/195</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/193" definition-exists="false" ipc-concordant="H03F3/193" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/193</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with field-effect devices </text><reference><text><class-ref scheme="cpc">H03F3/195</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/1935" definition-exists="false" ipc-concordant="H03F3/193" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/1935</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/195" definition-exists="false" ipc-concordant="H03F3/195" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/195</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in integrated circuits</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/20" definition-exists="true" ipc-concordant="H03F3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03F3/20</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Power amplifiers, e.g. Class B amplifiers, Class C amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/26</class-ref>&#160;-&#160;<class-ref scheme="cpc">H03F3/30</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/21" definition-exists="false" ipc-concordant="H03F3/21" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/21</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03F3/245</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/211" definition-exists="false" ipc-concordant="H03F3/21" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a combination of several amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/60</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/213" definition-exists="false" ipc-concordant="H03F3/213" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/213</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in integrated circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/217" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/217</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Class D power amplifiers</text></title-part><title-part><text>Switching amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/2171" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03F3/2171</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>with field-effect devices </text><reference><text><class-ref scheme="cpc">H03F3/2173</class-ref>&#160;-&#160;<class-ref scheme="cpc">H03F3/2178</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/2173" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/2173</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of the bridge type</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/2175" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/2175</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using analogue-digital or digital-analogue conversion </text><reference><text><class-ref scheme="cpc">H03F3/2173</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/2176" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/2176</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Class E amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/2178" definition-exists="true" ipc-concordant="H03F3/217" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/2178</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using more than one switch or switching amplifier in parallel or in series </text><reference><text><class-ref scheme="cpc">H03F3/2173</class-ref>, <class-ref scheme="cpc">H03F3/2175</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/22" definition-exists="true" ipc-concordant="H03F3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only </text><reference><text><class-ref scheme="cpc">H03F3/24</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/24" definition-exists="false" ipc-concordant="H03F3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of transmitter output stages</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/245" definition-exists="false" ipc-concordant="H03F3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/245</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with semiconductor devices only</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/26" definition-exists="true" ipc-concordant="H03F3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Push-pull amplifiers</text></title-part><title-part><text>Phase-splitters therefor </text><reference><text>duplicated single-ended push-pull arrangements or phase-splitters therefor <class-ref scheme="cpc">H03F3/30</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/265" definition-exists="false" ipc-concordant="H03F3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with field-effect transistors only</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/28" definition-exists="false" ipc-concordant="H03F3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/30" definition-exists="true" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Single-ended push-pull </text><CPC-specific-text><text>[SEPP]</text></CPC-specific-text><text> amplifiers </text><CPC-specific-text><reference><text>single-ended sense amplifiers <class-ref scheme="cpc">G11C7/067</class-ref></text></reference></CPC-specific-text></title-part><title-part><text>Phase-splitters therefor</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/3001" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with field-effect transistors</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/301" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/301</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>CMOS common drain output SEPP amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/3008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3015" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common source driving stage, i.e. inverting stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3016" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3016</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/302" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two SEPP driving stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3022" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>CMOS common source output SEPP amplifiers </text><reference><text><class-ref scheme="cpc">H03F3/3008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3025" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common drain driving stage, i.e. follower stage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3027" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common source driving stage, i.e. inverting stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3028" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/303" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using opamps as driving stages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3032" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3032</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two SEPP driving stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3033" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3033</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>NMOS SEPP output stages </text><reference><text><class-ref scheme="cpc">H03F3/3008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3035" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using differential amplifiers as phase-splitting elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3037" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3037</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetric control, i.e. one control branch containing a supplementary phase inverting stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3038" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3038</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>PMOS SEPP output stages </text><reference><text><class-ref scheme="cpc">H03F3/3008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/304" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/304</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using differential amplifiers as phase-splitting element</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3042" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetric control, i.e. one control branch containing a supplementary phase inverting stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3044" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3044</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Junction FET SEPP output stages </text><reference><text><class-ref scheme="cpc">H03F3/3008</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3045" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3047" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3047</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common drain driving stage, i.e. follower stage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3049" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3049</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a common source driving stage, i.e. inverting stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/305" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3052" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3052</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using opamps as driving stages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3054" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two SEPP driving stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3055" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3055</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Parallelled mixed SEPP stages, e.g. a CMOS common drain and a CMOS common source in parallel or bipolar SEPP and FET SEPP in parallel</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3057" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3059" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3059</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3061" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bridge type, i.e. two complementary controlled SEPP output stages</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3062" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3064" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/3066" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the collectors of complementary power transistors being connected to the output</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3067" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/3069" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the emitters of complementary power transistors being connected to the output</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3071" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3072" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using Darlington transistors </text><reference><text><class-ref scheme="cpc">H03F3/3074</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3074" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3074</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using parallel power transistors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3076" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with symmetrical driving of the end stage</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3077" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using Darlington transistors </text><reference><text><class-ref scheme="cpc">H03F3/3079</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3079" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3079</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using parallel power transistors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/3081" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Duplicated single-ended push-pull arrangements, i.e. bridge circuits </text><reference><text>using FET&apos;s <class-ref scheme="cpc">H03F3/3061</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/3083" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the power transistors being of the same type </text><reference><text><class-ref scheme="cpc">H03F3/3001</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3084" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>one of the power transistors being controlled by the output signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3086" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>two power transistors being controlled by the input signal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3088" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with asymmetric control, i.e. one control branch containing a supplementary phase inverting transistor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3089" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising field-effect transistors in the control circuit</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3091" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3091</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising two complementary transistors for phase-splitting</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3093" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a differential amplifier as phase-splitting element</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3094" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3094</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Phase splitters therefor </text><reference><text><class-ref scheme="cpc">H03F3/3088</class-ref>, <class-ref scheme="cpc">H03F3/3091</class-ref>, <class-ref scheme="cpc">H03F3/3093</class-ref>, <class-ref scheme="cpc">H03F3/3096</class-ref>, <class-ref scheme="cpc">H03F3/3098</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3096" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3096</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a single transistor with output on emitter and collector as phase splitter</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3098" definition-exists="false" ipc-concordant="H03F3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3098</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a transformer as phase splitter</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/34" definition-exists="true" ipc-concordant="H03F3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dc amplifiers in which all stages are dc-coupled </text><reference><text><class-ref scheme="cpc">H03F3/45</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/343" definition-exists="false" ipc-concordant="H03F3/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/343</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/3432" definition-exists="false" ipc-concordant="H03F3/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3432</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with bipolar transistors</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3435" definition-exists="false" ipc-concordant="H03F3/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3435</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using Darlington amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/3437" definition-exists="false" ipc-concordant="H03F3/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3437</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with complementary transistors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/345" definition-exists="false" ipc-concordant="H03F3/345" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/345</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with field-effect devices </text><reference><text><class-ref scheme="cpc">H03F3/347</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/3455" definition-exists="false" ipc-concordant="H03F3/345" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/3455</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/347" definition-exists="false" ipc-concordant="H03F3/347" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/347</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in integrated circuits</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/36" definition-exists="false" ipc-concordant="H03F3/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/38" definition-exists="true" ipc-concordant="H03F3/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dc amplifiers with modulator at input and demodulator at output</text></title-part><title-part><text>Modulators or demodulators specially adapted for use in such amplifiers </text><reference><CPC-specific-text><text>switched capacitor amplifiers <class-ref scheme="cpc">H03F3/005</class-ref></text></CPC-specific-text><text>; modulators in general <class-ref scheme="cpc">H03C</class-ref>; demodulators in general <class-ref scheme="cpc">H03D</class-ref>; amplitude modulation of pulses in general <class-ref scheme="cpc">H03K7/02</class-ref>; amplitude demodulation of pulses in general <class-ref scheme="cpc">H03K9/02</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/387" definition-exists="false" ipc-concordant="H03F3/387" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/387</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/393" definition-exists="false" ipc-concordant="H03F3/393" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/393</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with field-effect devices</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/40" definition-exists="false" ipc-concordant="H03F3/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/42" definition-exists="true" ipc-concordant="H03F3/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers with two or more amplifying elements having their dc paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/423" definition-exists="false" ipc-concordant="H03F3/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/423</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with MOSFET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/426" definition-exists="false" ipc-concordant="H03F3/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/426</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with junction-FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/44" definition-exists="false" ipc-concordant="H03F3/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/45" definition-exists="true" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Differential amplifiers </text><reference><text>differential sense amplifiers <class-ref scheme="cpc">G11C7/062</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/45071" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with semiconductor devices only</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/45076" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the way of implementation of the active amplifying circuit in the differential amplifier</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/4508" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/4508</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using bipolar transistors as the active amplifying circuit </text><reference><text><class-ref scheme="cpc">H03F3/45278</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/45085" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Long tailed pairs </text><reference><text><class-ref scheme="cpc">H03F3/45112</class-ref>, <class-ref scheme="cpc">H03F3/45139</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45089" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-folded cascode stages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45094" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45094</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Folded cascode stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/45098" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45098</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>PI types </text><reference><text><class-ref scheme="cpc">H03F3/45125</class-ref>, <class-ref scheme="cpc">H03F3/45152</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45107" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45107</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Folded cascode stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45358" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45358</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Folded cascode stages</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/45363" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45363</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Complementary cross coupled types</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45914" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45914</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using balancing means</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45919" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45919</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switching means</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45923" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45923</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using cross switches</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03F3/45928" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45928</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using IC blocks as the active amplifying circuit</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/45932" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45932</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using feedback means </text><reference><text><class-ref scheme="cpc">H03F3/45968</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45937" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45937</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Measuring at the loading circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45941" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45941</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the input circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45946" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45946</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the loading circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/4595" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/4595</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using feedforward means </text><reference><text><class-ref scheme="cpc">H03F3/45968</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45955" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45955</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Measuring at the input circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45959" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45959</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the input circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45964" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45964</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the loading circuit of the differential amplifier</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03F3/45968" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45968</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by offset reduction</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45973" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45973</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a feedback circuit</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45977" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45977</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switching means, e.g. sample and hold</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45982" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45982</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a feedforward circuit</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45986" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45986</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switching means, e.g. sample and hold</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03F3/45991" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45991</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using balancing means</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03F3/45995" definition-exists="false" ipc-concordant="H03F3/45" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/45995</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switching means</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/46" definition-exists="true" ipc-concordant="H03F3/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reflex amplifiers </text><CPC-specific-text><reference><text>reflection amplifiers <class-ref scheme="cpc">H03F3/608</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/48" definition-exists="false" ipc-concordant="H03F3/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/50" definition-exists="true" ipc-concordant="H03F3/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/505" definition-exists="false" ipc-concordant="H03F3/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/505</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with field-effect devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/52" definition-exists="false" ipc-concordant="H03F3/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/54" definition-exists="true" ipc-concordant="H03F3/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H03F3/54</classification-symbol><class-title date-revised="2023-02-01"><title-part><text>Amplifiers using transit-time effect in tubes or semiconductor devices </text><reference><text>parametric amplifiers <class-ref scheme="cpc">H03F7/00</class-ref>; solid state travelling-wave devices <class-ref scheme="cpc">H10N70/10</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/55" definition-exists="false" ipc-concordant="H03F3/55" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/55</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/56" definition-exists="false" ipc-concordant="H03F3/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using klystrons</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/58" definition-exists="false" ipc-concordant="H03F3/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using travelling-wave tubes</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/60" definition-exists="true" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators </text><reference><text><class-ref scheme="cpc">H03F3/54</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/601" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/601</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FET&apos;s, e.g. GaAs FET&apos;s </text><reference><text><class-ref scheme="cpc">H03F3/607</class-ref>, <class-ref scheme="cpc">H03F3/608</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/602" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/602</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Combinations of several amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/604" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/604</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/605" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/605</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Distributed amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03F3/607" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/607</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FET&apos;s</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/608" definition-exists="false" ipc-concordant="H03F3/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03F3/608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reflection amplifiers, i.e. amplifiers using a one-port amplifying element and a multiport coupler </text><reference><text><class-ref scheme="cpc">H03F7/00</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/62" definition-exists="true" ipc-concordant="H03F3/62" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/62</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two-way amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03F3/64" definition-exists="false" ipc-concordant="H03F3/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/64</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with tubes only</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/66" definition-exists="true" ipc-concordant="H03F3/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/66</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/68" definition-exists="true" ipc-concordant="H03F3/68" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/68</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics </text><CPC-specific-text><reference><text>power amplifiers using a combination of several semiconductor amplifiers <class-ref scheme="cpc">H03F3/211</class-ref>; combinations of amplifiers using coupling networks with distributed constants <class-ref scheme="cpc">H03F3/602</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/70" definition-exists="true" ipc-concordant="H03F3/70" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Charge amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F3/72" definition-exists="true" ipc-concordant="H03F3/72" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F3/72</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F5/00" definition-exists="false" ipc-concordant="H03F5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers with both discharge tubes and semiconductor devices as amplifying elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F7/00" definition-exists="true" ipc-concordant="H03F7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Parametric amplifiers </text><reference><CPC-specific-text><text><class-ref scheme="cpc">H03F19/00</class-ref> takes precedence</text></CPC-specific-text><text>; devices or arrangements for the parametric generation or amplification of light, infra-red or ultra-violet waves <class-ref scheme="cpc">G02F1/39</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F7/02" definition-exists="true" ipc-concordant="H03F7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using variable-inductance element</text></title-part><title-part><text>using variable-permeability element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F7/04" definition-exists="true" ipc-concordant="H03F7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using variable-capacitance element</text></title-part><title-part><text>using variable-permittivity element</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F9/00" definition-exists="true" ipc-concordant="H03F9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Magnetic amplifiers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F9/02" definition-exists="true" ipc-concordant="H03F9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>current-controlled, i.e. the load current flowing in both directions through a main coil</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F9/04" definition-exists="true" ipc-concordant="H03F9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits </text><reference><text><class-ref scheme="cpc">H03F9/06</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03F9/06" definition-exists="true" ipc-concordant="H03F9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control by voltage time integral, i.e. the load current flowing in only one direction through a main coil, whereby the main coil winding also can be used as a control winding, e.g. Ramey circuits</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F11/00" definition-exists="true" ipc-concordant="H03F11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dielectric amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F13/00" definition-exists="true" ipc-concordant="H03F13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F15/00" definition-exists="true" ipc-concordant="H03F15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F15/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F17/00" definition-exists="true" ipc-concordant="H03F17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers using electroluminescent element or photocell</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F19/00" definition-exists="false" ipc-concordant="H03F19/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F19/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifiers using superconductivity effects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03F99/00" definition-exists="true" ipc-concordant="H03F99/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-08-01" status="published"><classification-symbol>H03F99/00</classification-symbol><class-title date-revised="2022-08-01"><title-part><text>Subject matter not provided for in other groups of this subclass</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H03F200/00" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/00</classification-symbol>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03F200/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to amplifiers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being designed for audio applications</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/06" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A balun, i.e. balanced to or from unbalanced converter, being present at the input of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/09" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/09</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A balun, i.e. balanced to or from unbalanced converter, being present at the output of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/102" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A non-specified detector of a signal envelope being used in an amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/105" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A non-specified detector of the power of a signal being used in an amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/108" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/108</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A coil being added in the drain circuit of a FET amplifier stage, e.g. for noise reducing purposes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/111" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/111</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/114" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/114</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising means for electro-magnetic interference [EMI] protection</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/117" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/117</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A coil being coupled in a feedback path of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/12" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A bias circuit for some stages being shown using transmission lines</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A transistor in common gate configuration being used in a feedback circuit of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/123" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A difference signal between an output and an input signal of an amplifier being coupled back at the input of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/126" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode being coupled in a feedback path of an amplifier stage, e.g. active or passive diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/129" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/129</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>there being a feedback over the complete amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/132" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/132</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hybrid coupler placed in a feedback circuit of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/135" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/135</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>there being a feedback over one or more internal stages in the global amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/138" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/138</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit comprising a parallel resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/141" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit of the amplifier stage comprising a resistor and a capacitor in series, at least one of them being an active one</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/144" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/144</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit of the amplifier stage comprising a passive resistor and passive capacitor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/147" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/147</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit comprising a series resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/15" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/15</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply or bias voltage or current at the drain side of a FET being continuously controlled by a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/151" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/151</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A source follower being used in a feedback circuit of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/153" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/153</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feedback used to stabilise the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/156" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/156</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more switches are realised in the feedback circuit of the amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/159" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/159</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit being closed during a switching time</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/162" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/162</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>FETs are biased in the weak inversion region</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/165" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A filter circuit coupled to the input of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/168" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/168</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two amplifying stages are coupled by means of a filter circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/171" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/171</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A filter circuit coupled to the output of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/174" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/174</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Floating gate implemented in MOS technology</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/177" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/177</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Folded cascode realised by a folding coil</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/18" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the bias of the gate of a FET being controlled by a control signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/181" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/181</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A coil being added in the gate circuit of a FET amplifier stage, e.g. for noise reducing purposes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/183" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/183</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising a gated diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/186" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/186</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the ground, reference potential being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/189" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/189</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the ground, reference or shield potential difference between different chips being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/192" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/192</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used at the input of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/195" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/195</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used as power measuring circuit at the input of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/198" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/198</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used as coupling circuit between stages of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/201" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/201</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used as power measuring inter-stage circuit between two stages of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/204" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/204</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used at the output of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/207" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/207</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A hybrid coupler being used as power measuring circuit at the output of an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/21" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/21</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bias resistors are added at the input of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/211" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/211</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input of an amplifier can be attenuated by a continuously controlled transistor attenuator</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/213" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/213</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A variable capacitor being added in the input circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/216" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/216</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A coil being added in the input circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/219" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/219</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Follower transistors are added at the input of the amplifier, e.g. source or emitter followers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/222" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/222</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/225" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input circuit of an amplifying stage comprising an LC-network</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/228" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/228</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A measuring circuit being coupled to the input of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/231" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/231</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input of an amplifier can be switched on or off by a switch to amplify or not an input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/234" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/234</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input amplifying stage being one or more operational amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/237" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/237</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/24" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply or bias voltage or current at the source side of a FET being continuously controlled by a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/241" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/241</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance being added in shunt in the input circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/243" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/243</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/246" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/246</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance being added in shunt in the input circuit, e.g. base, gate, of an amplifier stage, e.g. as a trap</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/249" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/249</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A switch coupled in the input circuit of an amplifier being controlled by a circuit, e.g. feedback circuitry being controlling the switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/252" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/252</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple switches coupled in the input circuit of an amplifier are controlled by a circuit, e.g. feedback circuitry being controlling the switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/255" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/255</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifier input adaptation especially for transmission line coupling purposes, e.g. impedance adaptation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/258" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/258</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input of the amplifier has voltage limiting means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/261" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/261</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifier which being suitable for instrumentation applications</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/264" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/264</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An operational amplifier based integrator or transistor based integrator being used in an amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/267" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/267</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A capacitor based passive circuit, e.g. filter, being used in an amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/27" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/27</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A biasing circuit node being switched in an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/271" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/271</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses capacitive isolation means, e.g. capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/273" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/273</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses inductive isolation means, e.g. transformers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/276" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/276</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses optical isolation means, e.g. optical couplers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/279" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/279</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the level shifting stage between two amplifying stages being realised by an explicit differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/282" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/282</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the level shifting stage between two amplifying stages being realised by a diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/285" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/285</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the level shifting stage between two amplifying stages being realised by an emitter follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/288" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/288</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the level shifting stage between two amplifying stages being realised by a resistor or potentiometer</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/291" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/291</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the level shifting stage between two amplifying stages being realised by a source follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/294" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/294</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being a low noise amplifier [LNA]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/297" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/297</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage comprising a capacitor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/301" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/301</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage comprising a coil</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/303" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/303</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage comprising a diode or diode coupled transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/306" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/306</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage being a parallel resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/309" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/309</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage being a series resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/31" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/31</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the switching power stage comprising circuitry for emulating the behaviour of a bootstrap diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/312" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/312</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage comprising one or more switches</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/315" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/315</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the loading circuit of an amplifying stage comprising a transmission line</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/321" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/321</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Use of a microprocessor in an amplifier circuit or its control circuit</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/354" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/354</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising MOS which are biased in the moderate inversion region</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/363" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/363</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transistor with multiple emitters</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/375" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/375</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuitry to compensate the offset being present in an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/378" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/378</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A variable capacitor being added in the output circuit, e.g. collector, drain, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/381" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/381</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An active variable resistor, e.g. controlled transistor, being coupled in the output circuit of an amplifier to control the output</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/384" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/384</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifier without output filter, i.e. directly connected to the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/387" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/387</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/39" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/39</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Different band amplifiers are coupled in parallel to broadband the whole amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/391" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/391</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output circuit of an amplifying stage comprising an LC-network</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/393" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/393</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A measuring circuit being coupled to the output of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/396" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/396</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output of an amplifier can be switched on or off by a switch to couple the output signal to a load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/399" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/399</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance being added in shunt in the output circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/402" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/402</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance being added in shunt in the output circuit, e.g. base, gate, of an amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/405" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/405</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output amplifying stage of an amplifier comprising more than three power stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/408" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/408</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output amplifying stage of an amplifier comprising three power stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/411" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/411</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output amplifying stage of an amplifier comprising two power stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/414" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/414</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A switch being coupled in the output circuit of an amplifier to switch the output on/off</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/417" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/417</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A switch coupled in the output circuit of an amplifier being controlled by a circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/42" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input to the amplifier being made by capacitive coupling means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/421" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/421</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple switches coupled in the output circuit of an amplifier are controlled by a circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/423" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/423</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/426" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/426</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising circuitry for protection against overload</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/429" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/429</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/432" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/432</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more amplifiers of different type are coupled in parallel at the input or output, e.g. a class D and a linear amplifier, a class B and a class A amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/435" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/435</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A peak detection being used in a signal measuring circuit in a controlling circuit of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/438" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/438</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Separate feedback of amplitude and phase signals being present</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/441" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/441</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Protection of an amplifier being implemented by clamping means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/444" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/444</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diode used as protection means in an amplifier, e.g. as a limiter or as a switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/447" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/447</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being protected to temperature influence</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/45" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/45</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the load of the amplifier being a capacitive element, e.g. CRT</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/489" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/489</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A coil being added in the source circuit of a common source stage, e.g. as degeneration means</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/498" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/498</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A resistor being added in the source circuit of a transistor amplifier stage as degenerating element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/501" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/501</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being added in the source circuit of a FET amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/504" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/504</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply voltage or current being continuously controlled by a controlling signal, e.g. the controlling signal of a transistor implemented as variable resistor in a supply path for, an IC-block showed amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/507" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/507</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/51" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/51</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Capacitor in positive feedback circuit of an amplifier circuit to bootstrap a resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/511" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/511</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Many discrete supply voltages or currents or voltage levels can be chosen by a control signal in an IC-block amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/513" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/513</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being made for low supply voltages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/516" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/516</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Some amplifier stages of an amplifier use supply voltages of different value</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/519" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/519</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the bias or supply voltage or current of the drain side of a FET amplifier being controlled to be on or off by a switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/522" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/522</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the bias or supply voltage or current of the gate side of a FET amplifier being controlled to be on or off by a switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/525" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/525</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the bias or supply voltage or current of the source side of a FET amplifier being controlled to be on or off by a switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/528" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/528</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the temperature dependence being controlled by referencing to the band gap</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/531" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/531</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the temperature difference between different chips being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/534" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/534</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transformer coupled at the input of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/537" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/537</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A transformer being used as coupling element between two amplifying stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/54" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more capacitor coupled amplifier stages in cascade</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/541" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/541</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transformer coupled at the output of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/543" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/543</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A transmission line being used as coupling element between two amplifying stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/546" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/546</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A tunable capacitance being present in an amplifier circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/549" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/549</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising means to emulate the vacuum tube behaviour</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/552" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/552</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being made for video applications</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/555" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/555</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A voltage generating circuit being realised for biasing different circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/57" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/57</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Separate feedback of real and complex signals being present</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/61" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/61</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the cascode amplifier has more than one common gate stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/63" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/63</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier being suitable for CATV applications</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/66" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/66</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Clipping circuitry being present in an amplifier, i.e. the shape of the signal being modified</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/69" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/69</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier stage being a common drain coupled MOSFET, i.e. source follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/72" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/72</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier stage being a common gate configuration MOSFET</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/75" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/75</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier stage being a common source configuration MOSFET</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/78" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/78</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A comparator being used in a controlling circuit of an amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/81" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/81</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Inputs or outputs are crossed during a first switching time, not crossed during a second switching time</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/87" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/87</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the cross coupling circuit being realised only by MOSFETs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/91" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/91</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier has a current mode topology</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/93" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/93</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more transistors are coupled in a Darlington composite transistor configuration, all transistors being of the same type</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/96" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/96</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more complementary transistors are coupled in a Darlington composite transistor configuration</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F200/99" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2200/99</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode as rectifier being used as a detecting circuit in an amplifying circuit</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03F201/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by <class-ref scheme="cpc">H03F1/00</class-ref></text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F201/32" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3203" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3203</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising means for back off control in order to reduce distortion</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3206" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3206</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple channels are combined and amplified by only one amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3209" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3209</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifier comprising means for compensating memory effects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3212" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Using a control circuit to adjust amplitude and phase of a signal in a signal path</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3215" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3215</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>To increase the output power or efficiency</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3218" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3218</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the main amplifier or error amplifier being a feedforward amplifier</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3224" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3224</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Predistortion being done for compensating memory effects</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3227" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3227</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3231" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3231</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptive predistortion using phase feedback from the output of the main amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3233" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3233</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F201/3236" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2201/3236</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A generated signal, e.g. a pulse or an inverted synchronous signal, being added to avoid certain conditions, e.g. clipping</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03F203/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by <class-ref scheme="cpc">H03F3/00</class-ref></text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F203/20" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/21" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with semiconductor devices only</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03F203/211" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/211</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a combination of several amplifiers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21103" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21103</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An impedance adaptation circuit being added at the input of a power amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21106" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21106</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal being distributed in parallel over the inputs of a plurality of power amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21109" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21109</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal being distributed by switching to a plurality of paralleled power amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21112" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03F2203/21112</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>A filter circuit being added at the input of a power amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21115" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21115</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal dependant signal being measured by current measuring at the input of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21118" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21118</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal dependant signal being measured by power measuring at the input of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal dependant signal being measured by voltage measuring at the input of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21124" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21124</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance circuit being coupled at the input of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21127" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21127</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input bias current of a power amplifier being controlled, e.g. by an active current source or a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21131" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21131</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input bias voltage of a power amplifier being controlled, e.g. by a potentiometer or an emitter follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21133" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21133</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being coupled at the input of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21136" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21136</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal of a power amplifier being on/off switched</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21139" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21139</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An impedance adaptation circuit being added at the output of a power amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21142" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21142</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Output signals of a plurality of power amplifiers are parallel combined to a common output</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21145" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21145</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Output signals are combined by switching a plurality of paralleled power amplifiers to a common output</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21148" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21148</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal of a power amplifier being controlled by controlling current signal, e.g. by controlled current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21151" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21151</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal of a power amplifier being controlled by controlling power signal, e.g. by an inductive coupler</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21154" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21154</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal of a power amplifier being controlled by controlling voltage signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21157" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21157</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A filter circuit being added at the output of a power amplifier stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21161" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21161</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal dependant signal being measured by current measuring at the output of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21163" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21163</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal dependant signal being measured by power measuring, e.g. by an inductive coupler, at the output of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21166" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21166</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal dependant signal being measured by voltage measuring at the output of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21169" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21169</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance circuit being coupled at the output of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21172" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21172</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being coupled at the output of a power amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21175" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21175</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An output signal of a power amplifier being on/off switched</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21178" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21178</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Power transistors are made by coupling a plurality of single transistors in parallel</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21181" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21181</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply current of a power amplifier being continuously controlled, e.g. by controlling current sources or resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21184" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21184</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply current of a power amplifier being continuously measured, e.g. by a resistor, a current mirror, to produce a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21187" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21187</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply current of a power amplifier being measured discontinuously in time, e.g. by sampling, to produce a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21191" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21191</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply current of a power amplifier being switchable controlled, e.g. by choosing different current sources or resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21193" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21193</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply voltage of a power amplifier being continuously controlled, e.g. by an active potentiometer</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03F203/21196" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/21196</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the supply voltage of a power amplifier being switchable controlled</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F203/30" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to single-ended push-pull [SEPP]</text></title-part><title-part><text>Phase-splitters therefor</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP amplifier stage comprising calibration possibility</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push and the pull stages of the SEPP amplifier are both current mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30009" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push and pull stages of the SEPP amplifier are both cascode current mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the two SEPP amplifying transistors are Darlington composite transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An input signal dependent control signal controls the bias of an output stage in the SEPP</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series coupled active resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30021" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30021</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A capacitor being coupled in a feedback circuit of a SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30024</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP bias current being controlled by a control signal from a feedback circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30027" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30027</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP bias voltage being controlled by a control signal from a feedback circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A resistor being coupled as feedback circuit in the SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30033" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30033</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series coupled resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A feedback circuit to stabilise the SEPP being used</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30039" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30039</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP bias current being controlled by a control signal from a feedforward circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP bias voltage being controlled by a control signal from a feedforward circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30045" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30045</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP power transistors comprising measuring push or pull transistors to produce a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30048" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30048</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP amplifier has multiple SEPP outputs from paralleled output stages coupled in one or more outputs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30051" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30051</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP amplifying transistors are composed of multiple coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30054" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP power transistors are realised as paralleled cascode coupled transistors, i.e. the push or the pull transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30057" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30057</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP power transistors are realised as paralleled FETs, i.e. the push or the pull transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30061" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30061</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more current mirrors are used as bias circuit or stages for the push or pull stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30063" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30063</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A differential amplifier being used in the bias circuit or in the control circuit of the SEPP-amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30066" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A optical element being used in the bias circuit of the SEPP-amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30069" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30069</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A SEPP amplifier with a reactive element in the bias circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30072" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP has a power supply switchable by a controlling signal derived from the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30075" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30075</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP has a power supply switchable by a controlling signal derived from the output signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30078" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30078</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A resistor being added in the pull stage of the SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30081" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30081</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull transistor circuit comprising one or more capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30084" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30084</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull circuit of the SEPP amplifier being a cascode circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30087" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30087</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Only the bias of the pull transistor of the SEPP being dynamically controlled by the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30091" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30091</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull side of the SEPP amplifier has an extra drive follower stage to control this pull side</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30093" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30093</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull side of the SEPP amplifier has an extra drive inverter stage to control this pull side</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30096" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30096</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An op amp being used as extra drive amp for the pull side of the SEPP</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30099" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30099</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull transistor being gated by a switching element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30102" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30102</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull transistor has a measuring transistor for controlling purposes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30105" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30105</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull transistor of the asymmetrically driven SEPP amplifier being a driven current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30108" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30108</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the pull transistor of the SEPP amplifier being a cascode current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30111" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30111</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A resistor being added in the push stage of the SEPP amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30114" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30114</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push transistor circuit comprising one or more capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30117" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30117</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push circuit of the SEPP amplifier being a cascode circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Only the bias of the push transistor of the SEPP being dynamically controlled by the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30123" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30123</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push side of the SEPP amplifier has an extra drive follower stage to control this push side</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30126" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30126</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push side of the SEPP amplifier has an extra drive inverter stage to control this push side</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30129" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30129</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An op amp being used as extra drive amp for the push side of the SEPP</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30132" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30132</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push transistor being gated by a switching element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30135" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30135</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push transistor has a measuring transistor for controlling purposes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30138" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30138</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push transistor of the asymmetrically driven SEPP amplifier being a driven current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30141" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30141</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the push transistor of the SEPP amplifier being a cascode current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30144" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30144</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the SEPP comprising a reactive element in the amplifying circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30147" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30147</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the current sink of the push driven, i.e. source driven SEPP amplifier being a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30151" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30151</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the current sink of the push driven, i.e. source driven SEPP amplifier being a cascode current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30153" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30153</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the current source of the pull driven, i.e. sink driven SEPP amplifier being a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/30156" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/30156</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the current source of the pull driven, i.e. sink driven SEPP amplifier being a cascode current mirror</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F203/45" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to differential amplifiers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45002" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45002</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made by addition of two currents by coupling the outputs of two current mirrors in parallel</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45004" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45004</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made by addition of two currents by coupling two current sources in parallel</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made by two emitter or source coupled followers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45008" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45008</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made by a resistor addition circuit for producing the common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45011" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45011</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made in a source degeneration circuit of a current mirror for producing the common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made in a switched capacitor circuit for producing the common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45014" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45014</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made in the tail circuit of a differential amplifier for producing the common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45016" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45016</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the addition of two signals being made by paralleling two triode biased transistors for producing the common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors have added cross couplings</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45021" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45021</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more added diodes to the amplifying transistors in the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45022" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45022</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more added resistors to the amplifying transistors in the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45024</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors are cascode coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45026" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45026</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more current sources are added to the amplifying transistors in the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45028" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45028</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors are folded cascode coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors are compositions of multiple transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45032" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45032</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors are multiple paralleled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45034" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45034</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more added reactive elements, capacitive or inductive elements, to the amplifying transistors in the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier amplifying transistors are single transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45038" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more current sources are added or changed as balancing means to reduce the offset of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45041" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45041</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Fuses are blown to balance the dif amp to reduce the offset of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more resistors are added or changed as balancing to reduce the offset of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45044" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45044</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more switches are opened or closed to balance the dif amp to reduce the offset of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45046" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45046</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the base current of the amplifying transistors of a dif amp being compensated for providing a greater input impedance of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45048" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45048</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Calibrating and standardising a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45051" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45051</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more differential amplifiers cascade coupled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45052" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45052</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the cascode stage of the cascode differential amplifier being controlled by a controlling signal, which controlling signal can also be the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45054" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the cascode stage of the cascode dif amp being a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45056" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45056</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or both transistors of the cascode stage of a differential amplifier being composed of more than one transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45058" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45058</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the cascode stage of the differential amplifier comprising a reactive element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45061" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45061</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode reference signal being taken or deducted from the one or more inputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45062" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45062</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal, e.g. voltage or current being added to the cascode stage of the cascode or folded cascode differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45064" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45064</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added to the folding circuit of the folded differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45066" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added at the one or more inputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45068" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added at the one or more outputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45071" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45071</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added at the substrate or body regions of the components of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45072" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode voltage or current signal being added to the tail circuit of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45074" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45074</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A comparator circuit compares the common mode signal to a reference before controlling the differential amplifier or related stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45076" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45076</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added to or controls the differential amplifier, and being a current signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45078" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45078</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal being taken or deducted from the one or more inputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45081" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45081</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal being level shifted before using it for controlling or adding</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45082" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45082</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal being taken or deducted from the one or more outputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45084" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45084</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal circuit comprising one or more inductive or capacitive elements, e.g. filter circuitry</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45086" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode signal being taken or deducted from the tail circuit of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45088" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45088</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the resulting deducted common mode signal being added to or controls the differential amplifier, and being a voltage signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45091" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45091</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two complementary type differential amplifiers are paralleled, e.g. one of the p-type and one of the n-type</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45092" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45092</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two current sources bias one set of two common base transistors cascaded with two other common base transistors, the common base transistors being driven complementary</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45094" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45094</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp being realized by coupling the emitters respectively sources of two common collector respectively drain transistors of a first type to the emitters respectively sources of two common base respectively gate transistors of a second complementary type</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45096" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03F2203/45096</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>the difference of two signals being made by, e.g. combining two or more current mirrors, e.g. differential current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45098" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45098</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two current mirrors coupled in a subtracting configuration</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45101" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45101</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Control of the DC level being present</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45102" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45102</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode being used as clamping element at the input of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45104" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45104</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode being used as clamping element at the loading circuit of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45106" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45106</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode being used as clamping element at the output of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45108" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45108</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A diode being used as level shifter between stages or in a follower in relation with a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45111" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45111</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps of the same type are used one dif amp for each input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45112" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45112</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the biasing of the differential amplifier being controlled from the input or the output signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45114" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45114</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains another differential amplifier in its feedback circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45116" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45116</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Feedback coupled to the input of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45118" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45118</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one reactive element being added to at least one feedback circuit of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45121" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45121</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A floating gate element being part of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45122" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45122</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the folded cascode stage of the folded cascode differential amplifier being controlled by a controlling signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45124" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45124</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the folded cascode stage of the folded cascode dif amp being a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45126" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45126</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or both transistors of the folded cascode stage of a folded cascode dif amp are composed of more than one transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45128" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45128</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the folded cascode stage of the folded cascode dif amp contains a reactive element</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45131" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45131</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A follower being added between the dif amp and other explicit stages in the amplifying circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45132" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45132</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A source follower using multiple single follower stages cascaded in a composed follower being added to the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45134" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45134</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the whole differential amplifier together with other coupled stages being fully differential realised</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45136" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45136</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One differential amplifier in IC-block form being shown</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45138" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45138</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45141" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45141</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A cross coupled pair of transistors being added in the input circuit of a differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45142" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45142</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one diode being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45144" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45144</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one follower being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45146" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45146</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one op amp being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45148" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45148</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one reactive element being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45151" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45151</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one resistor being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45152" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45152</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Balancing means being added at the input of a dif amp to reduce the offset of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45154" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45154</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the bias at the input of the amplifying transistors being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45156" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45156</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one capacitor being added at the input of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45158" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45158</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more diodes coupled at the inputs of a dif amp as clamping elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45161" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45161</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more diodes coupled at the inputs of a dif amp as level shifting circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45162" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45162</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance circuit being added in the one or more input circuits of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45164" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45164</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being added in the one or more input circuits of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45166" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45166</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Only one input of the dif amp being used for an input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45168" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45168</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A dif amp being used as input stage to one or more other non-differential stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45171" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45171</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input signal being switched to the one or more input terminals of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45172" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45172</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A transformer being added at the input of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45174" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45174</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the application of the differential amplifier being in an integrator circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45176" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45176</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A cross coupling circuit, e.g. consisting of two cross coupled transistors, being added in the load circuit of the amplifying transistors of a differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45178" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45178</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains one or more extra resistors in the active load circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45181" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45181</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Compensation of unbalanced loading in dif amps, e.g. unbalancing by connecting unequal circuits on both load circuits of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45182" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45182</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains one or more cascode current mirrors in the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45184" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45184</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier has one or more cascode current sources in the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45186" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45186</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains clamping components in the load circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45188" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45188</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains one or more current sources in the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45191" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45191</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more diodes not belonging to a current mirror as loads of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45192" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45192</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains current mirrors comprising diodes which act as a load for the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45194" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45194</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one active load circuit of the two load circuits in a differential amplifier being realised with a combination of more than one transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45196" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45196</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A differential amplifier with one or more parallel coupled LC-circuits as load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45198" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45198</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance circuit being added in the one or more load circuits of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45201" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45201</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains one or more reactive elements, i.e. capacitive or inductive elements, in the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45202" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45202</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains only resistors in the load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45204" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45204</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being added in the one or more load circuits of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45206" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45206</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or two switches are coupled in the loading circuit of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45208" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45208</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp being of the long tail pair type, one current source being coupled to the common emitter of the amplifying transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45211" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45211</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the amplifying transistors have multiple collectors with a cross coupling</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45212" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier being designed to have a reduced offset</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45214" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45214</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Offset in a differential amplifier being reduced by control of the substrate voltage, the voltage being either fixed or variable</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45216" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45216</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A cross coupling circuit being added at the output terminals of the amplifying transistors of a differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45218" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45218</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diode clamping means are present at the output of a differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45221" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45221</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output signal being taken from the two complementary outputs of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45222" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45222</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier output being directly controlled by a feedback or feedforward circuit coupled at the output of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45224" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45224</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One output of the differential amplifier being taken into consideration</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45226" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45226</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output signal being switched taken from the one or more output terminals of the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45228" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45228</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A transformer being added at the output or the load circuit of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45231" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45231</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps of the cascode type are paralleled at their input gates or bases</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45232" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45232</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps of the folded cascode type are paralleled at their input gates or bases</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45234" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45234</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps, one of them being of the cascade type and the other one of the folded cascade type, are paralleled at their input gates or bases</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45236" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45236</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps realised in MOS or JFET technology, one of them being of the p-channel type and the other one of the n-channel type, are coupled in parallel with their gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45238" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45238</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps realised in FET technology, the dif amps being either both of the NMOS type or both of the PMOS type, are coupled in parallel with their gates and their drains</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45241" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45241</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps realised in MOS or JFET technology, the dif amps being either both of the p-channel type or both of the n-channel type, are coupled in parallel with their gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45242" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45242</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two dif amps are paralleled at their inputs, the dif amps being of different types, e.g. one long tail type and one complementary or pi type</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45244" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45244</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier contains one or more explicit bias circuits, e.g. to bias the tail current sources, to bias the load transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45246" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45246</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp being biased in the subthreshold region</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45248" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45248</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp being designed for improving the slew rate</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45251" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45251</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp has a cross coupling circuit in the source circuit of the amplifying transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45252" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45252</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diodes are added in the source circuit of the amplifying FETs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45254" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45254</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A parallel resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45256" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45256</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more reactive elements are added in the source circuit of the amplifying FETs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45258" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45258</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Resistors are added in the source circuit of the amplifying FETs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45261" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45261</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A series resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45262" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45262</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the two amplifying FETs, amplifying two complementary input signals, are not source coupled, i.e. no tail being present</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45264" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45264</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the dif amp comprising frequency or phase stabilisation means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45266" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45266</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the stage cascaded to the dif amp being an asymmetrical follower stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45268" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45268</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>A common gate stage being coupled at the one or more outputs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45271" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45271</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output current being reduced by a transistor which being controlled by the input signal to sink current</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45272" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45272</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output current being increased by a transistor which being controlled by the input signal to source current</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45274" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45274</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Level shifting stages are added to the differential amplifier at a position other than the one or more inputs of the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45276" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45276</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>An op amp as stage being coupled to the output of a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45278" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45278</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two SEPP stages are added to the differential amplifier, the outputs of the two SEPP stages being the two outputs of the whole amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45281" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45281</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One SEPP output stage being added to the differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45282" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45282</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the differential amplifier being coupled to a symmetrical follower output stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45284" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45284</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Sensing the temperature dependence by a temperature dependant sensor, e.g. a resistor, a diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45286" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45286</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the temperature dependence of a differential amplifier being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45288" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45288</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Differential amplifier with circuit arrangements to enhance the transconductance</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45291" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45291</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the active amplifying circuit [AAC] comprising balancing means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45292" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45292</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising biasing means controlled by the signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45294" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45294</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising biasing means to stabilise itself</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45296" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45296</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more discrete capacitive elements, e.g. a transistor coupled as capacitor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45298" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45298</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more combinations of discrete capacitor and resistor elements, e.g. active elements using a transistor as a capacitor or as a resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45301" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45301</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>there are multiple cascaded folded or not folded common gate stages of a cascode dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45302" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45302</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common gate stage of a cascode dif amp being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45304" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45304</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common gate stage of a BIFET cascode dif amp being implemented fully by FETs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45306" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45306</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common gate stage implemented as dif amp eventually for cascode dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45308" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45308</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common gate stage of a cascode dif amp being implemented as one mirror circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45311" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45311</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common gate stage of a cascode dif amp being implemented by multiple transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45312" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45312</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>there being only one common gate stage of a cascode dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45314" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45314</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising clamping means, e.g. diodes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45316" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45316</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more discrete inductive elements or coils</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45318" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45318</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising a cross coupling circuit, e.g. two extra transistors cross coupled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45321" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45321</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common source stage of a BIFET cascode dif amp being implemented fully by FETs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45322" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45322</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more current sources are added to the AAC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45324" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45324</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising a Darlington transistor circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45326" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45326</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more extra diodes, e.g. as level shifter, as diode coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45328" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45328</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one diode coupled AAC-transistor in a follower combination with the other AAC circuit part</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45331" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45331</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more diodes coupled as a shunt between the AAC-transistors in the AAC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45332" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45332</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more capacitors as feedback circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45334" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45334</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more dif amps as feedback circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45336" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45336</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more resistors as feedback circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45338" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45338</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more series circuits of a resistor and a capacitor as feedback circuit elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45341" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45341</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising controlled floating gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45342" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45342</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising control means on a back gate of the AAC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45344" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45344</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>At least one of the AAC sub-circuits being a current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45346" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45346</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more FETs with multiple drains</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45348" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45348</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more FETs with multiple gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45351" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45351</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more FETs with multiple sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45352" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45352</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising a combination of a plurality of transistors, e.g. Darlington coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45354" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45354</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising offset means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45356" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45356</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more op-amps, e.g. IC-blocks</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45358" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45358</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their sources and drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45361" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45361</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45362" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45362</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their gates and drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45364" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45364</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their gates and sources only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45366" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45366</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their gates only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45368" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45368</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors parallel coupled at their sources only, e.g. in a cascode dif amp, only those forming the composite common source transistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45371" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45371</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising parallel coupled multiple transistors at their source and gate and drain or at their base and emitter and collector, e.g. in a cascode dif amp, only those forming the composite common source transistor or the composite common emitter transistor respectively</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45372" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45372</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45374" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45374</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more discrete resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45376" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45376</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more discrete resistors as shunts between collectors or drains</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45378" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45378</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising saturation or cutoff avoiding means, e.g. as a feedback circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45381" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45381</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising multiple transistors coupled in shunt</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45382" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45382</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45384" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45384</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling in which the common gate stage being controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45386" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45386</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more coils in the source circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45388" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45388</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising diodes in the source circuit of the AAC before the common source coupling</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45391" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45391</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising potentiometers in the source circuit of the AAC before the common source coupling</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45392" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45392</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising resistors in the source circuit of the AAC before the common source coupling</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45394" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45394</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC of the dif amp comprising FETs whose sources are not coupled, i.e. the AAC being a pseudo-differential amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45396" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45396</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising one or more switches</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45398" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45398</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the AAC comprising a voltage generating circuit as bias circuit for the AAC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45401" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45401</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common mode controlling loop [CMCL] comprising a transistor resistor addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45402" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45402</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a buffered addition circuit, i.e. the signals are buffered before addition, e.g. by a follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45404" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45404</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising capacitors containing, not in parallel with the resistors, an addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45406" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45406</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a common source node of a long tail FET pair as an addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45408" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45408</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a short circuited differential output of a dif amp as an addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45411" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45411</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a diode addition circuit, e.g. using diode connected transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45412" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45412</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a folding circuit as addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45414" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45414</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a current mirror addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45416" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45416</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising no addition of the dif signals to produce a common mode signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45418" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45418</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a resistor addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45421" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45421</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a switched capacitor addition circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45422" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45422</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising one or more capacitors not as integrating capacitor, e.g. for stability purposes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45424" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45424</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a comparator circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45426" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45426</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a comparator circuit with extra buffering means before comparison of the common mode signal, e.g. by a follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45428" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45428</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a comparator circuit using a four inputs dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45431" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45431</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL output control signal being a current signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45432" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45432</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL output control signal being a current signal and being buffered before used to control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45434" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45434</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL output control signal being a voltage signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45436" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45436</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL output control signal being a voltage signal and being buffered before used to control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45438" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45438</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL uses digital signals</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45441" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45441</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising an integrating circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45442" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45442</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising multiple loops for the same stage or for different stages in the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45444" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45444</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CMCL comprising a sample and hold circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45446" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45446</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>there are two or more CMCLs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45448" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45448</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the common source circuit [CSC] comprising an addition circuit made by mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45451" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45451</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising an addition circuit made by added current sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45452" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45452</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising balancing means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45454" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45454</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising biasing means controlled by the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45456" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45456</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising bias stabilisation means, e.g. DC-level stability, positive or negative temperature coefficient dependent control</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45458" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45458</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45461" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45461</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more switched capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45462" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45462</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a cascode circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45464" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45464</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more coils</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45466" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45466</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45468" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45468</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45471" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45471</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more extra current sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45472" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45472</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more diodes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45474" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45474</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising controlled one or more floating gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45476" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45476</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a mirror circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45478" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45478</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a cascode mirror circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45481" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45481</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising only a direct connection to the supply voltage, no other components being present</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45482" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45482</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising offset means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45484" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45484</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more op-amps</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45486" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45486</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising two or more paralleled transistors as current source</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45488" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45488</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC being a pi circuit and a capacitor being used at the place of the resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45491" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45491</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC being a pi circuit and the resistor being implemented by one or more transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45492" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45492</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC being a pi circuit and the resistor being implemented by one or more controlled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45494" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45494</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45496" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45496</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising one or more extra resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45498" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45498</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising only resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45501" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45501</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a L-C parallel resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45502" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45502</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a L-C series resonance circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45504" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45504</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising more than one switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45506" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45506</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising only one switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45508" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45508</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the CSC comprising a voltage generating circuit as bias circuit for the CSC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45511" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45511</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the feedback circuit [FBC] comprising one or more transistor stages, e.g. cascaded stages of the dif amp, and being coupled between the loading circuit [LC] and the input circuit [IC]</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45512" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45512</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more capacitors, not being switched capacitors, and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45514" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45514</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more switched capacitors, and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45516" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45516</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising a coil and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45518" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45518</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more diodes and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45521" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45521</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising op amp stages, e.g. cascaded stages of the dif amp and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45522" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45522</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45524" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45524</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more active resistors and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45526" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45526</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45528" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45528</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising one or more passive resistors and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45531" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45531</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising a parallel resonance circuit and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45532" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45532</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the FBC comprising a series resonance circuit and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45534" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03F2203/45534</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>the FBC comprising multiple switches and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45536" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03F2203/45536</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>the FBC comprising a switch and being coupled between the LC and the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45538" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45538</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising balancing means, e.g. trimming means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45541" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45541</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising dynamic biasing means, i.e. controlled by the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45542" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45542</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising bias stabilisation means, e.g. DC level stabilisation, and temperature coefficient dependent control, e.g. by DC level shifting</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45544" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45544</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more capacitors, e.g. coupling capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45546" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45546</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more capacitors feedback coupled to the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45548" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45548</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more capacitors as shunts to earth or as short circuit between inputs</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45551" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45551</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more switched capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45552" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45552</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising clamping means, e.g. diodes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45554" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45554</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more coils</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45556" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45556</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising a common gate stage as input stage to the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45558" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45558</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC being coupled at the sources of the source coupled pair</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45561" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45561</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45562" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45562</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45564" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45564</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more extra current sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45566" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45566</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more dif stages in cascade with the dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45568" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45568</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more diodes as shunt to the input leads</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45571" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03F2203/45571</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>the IC comprising two diodes, e.g. Gilbert circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45572" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45572</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more Zener diodes to the input leads</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45574" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45574</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising four or more input leads connected to four or more AAC-transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45576" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45576</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising input impedance adapting or controlling means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45578" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45578</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more diodes as level shifters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45581" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45581</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more resistors as level shifters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45582" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45582</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more voltage sources as level shifters</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45584" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45584</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising extra differentially coupled transistors for controlling purposes only</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45586" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45586</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising offset generating means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45588" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45588</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising offset compensating means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45591" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45591</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45592" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45592</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more buffer stages other than emitter or source followers between the input signal leads and input leads of the dif amp, e.g. inverter stages</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45594" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45594</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more resistors, which are not biasing resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45596" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45596</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more biasing resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45598" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45598</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising an input shunting circuit comprising a resistor and a capacitor in series</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45601" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45601</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more passive resistors by feedback</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45602" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45602</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more active resistors by feedback</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45604" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45604</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising a input shunting resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45606" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45606</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more parallel resonance circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45608" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45608</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more series resonance circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45611" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45611</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising only one input signal connection lead for one phase of the signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45612" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45612</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising one or more input source followers as input stages in the IC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45614" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45614</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising two cross coupled switches</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45616" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45616</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising more than one switch, which are not cross coupled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45618" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45618</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising only one switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45621" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45621</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the IC comprising a transformer for phase splitting the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45622" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03F2203/45622</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>the IC comprising a voltage generating circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45624" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45624</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising balancing means, e.g. trimming means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45626" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45626</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising biasing means controlled by the input signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45628" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45628</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising bias stabilisation means, e.g. DC level stabilisation means, and temperature coefficient dependent control, e.g. DC level shifting means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45631" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45631</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more capacitors, e.g. coupling capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45632" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45632</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more capacitors coupled to the LC by feedback</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45634" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45634</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more switched capacitors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45636" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45636</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising clamping means, e.g. diodes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45638" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45638</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more coils</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45641" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45641</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45642" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45642</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC, and possibly also cascaded stages following it, being (are) controlled by the common mode signal derived to control a dif amp</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45644" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45644</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45646" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45646</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising an extra current source</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45648" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45648</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two current sources, which are not cascode current sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45651" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45651</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two cascode current sources</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45652" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45652</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more further dif amp stages, either identical to the dif amp or not, in cascade</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45654" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45654</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more extra diodes not belonging to mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45656" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45656</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one diode of a current mirror, i.e. forming an asymmetrical load</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45658" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45658</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two diodes of current mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45661" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45661</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more controlled floating gates</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45662" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45662</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising inductive coupled loading elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45664" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45664</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more cascaded inverter stages as output stage at one output of the dif amp circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45666" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45666</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two anti-phase controlled inverter circuits as output stages, e.g. fully differential</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45668" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45668</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a level shifter circuit, which does not comprise diodes</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45671" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45671</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more diodes as level shifter</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45672" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45672</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more resistors as level shifter</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45674" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45674</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45676" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45676</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one cascode current mirror</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45678" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45678</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising offset generating means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45681" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45681</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising offset compensating means</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45682" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45682</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more op-amps</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45684" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45684</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more buffers or driving stages not being of the emitter respectively source follower type, between the output of the dif amp and the output stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45686" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45686</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more potentiometers, which are not shunting potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45688" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45688</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more shunting potentiometers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45691" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45691</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more transistors as active loading resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45692" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45692</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more resistors in series with a capacitor coupled to the LC by feedback</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45694" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45694</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising more than one shunting resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45696" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45696</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising more than two resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45698" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45698</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more resistors coupled to the LC by feedback (active or passive)</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45701" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45701</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one resistor</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45702" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45702</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two resistors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45704" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45704</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more parallel resonance circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45706" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45706</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more series resonance circuits</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45708" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45708</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one SEPP circuit as output stage</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45711" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45711</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two anti-phase controlled SEPP circuits as output stages, e.g. fully differential</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45712" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45712</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a capacitor as shunt</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45714" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45714</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a coil as shunt</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45716" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45716</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a RC-series circuit as shunt, e.g. for stabilisation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45718" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45718</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a resistor as shunt</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45721" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45721</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising only an output circuit for one phase of the signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45722" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45722</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one or more source followers, as post buffer or driver stages, in cascade in the LC</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45724" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45724</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising two cross coupled switches</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45726" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45726</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising more than one switch, which are not cross coupled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45728" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45728</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising one switch</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45731" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45731</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a transformer</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/45732" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/45732</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the LC comprising a voltage generating circuit</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F203/50" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to amplifiers in which input being applied to, or output being derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the sources of two source followers are differentially coupled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the input signal being capacitively coupled to the gate of the source follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5009" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the output signal being capacitively coupled to the source of the source follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a controlled source circuit, the controlling signal being derived from the drain circuit of the follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a controlled source circuit, the controlling signal being derived from the gate circuit of the follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a controlled source circuit, the controlling signal being derived from the source circuit of the follower</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5021" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5021</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a controlled source circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5024</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a controlled source circuit, the source circuit being controlled via a capacitor, i.e. AC-controlled</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5027" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5027</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a current mirror output circuit in its source circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source circuit of the follower being a current source</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5033" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5033</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Two source followers are controlled at their inputs by a differential signal</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a resistor in its source circuit</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5039" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5039</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source circuit of the follower has one or more capacitors between source and supply</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source circuit of the follower has one or more coils between source and supply</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/5045" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/5045</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the source follower has a level shifter between source and output, e.g. a diode-connected transistor</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03F203/72" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/72</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7203" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7203</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias current in the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7206" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7206</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias voltage in the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7209" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7209</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched from a first band to a second band</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7212" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7212</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by switching off or on a feedback control loop of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7215" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7215</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by a switch at the input of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7218" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7218</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by clamping by a switch at the input of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7221" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7221</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by a switch at the output of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7224" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7224</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by clamping by a switch at the output of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7227" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7227</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7231" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7231</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by putting into cascade or not, by choosing between amplifiers by one or more switch(es)</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7233" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7233</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier, switched on or off by putting into parallel or not, by choosing between amplifiers by one or more switch(es), being impedance adapted by switching an adapted passive network</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7236" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7236</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es)</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03F203/7239" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03F2203/7239</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers and shunting lines by one or more switch(es)</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme>
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