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176 lines
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176 lines
95 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="H03D" definition-exists="true" date-revised="2020-05-01" status="published"><classification-symbol>H03D</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER </text><reference><text>masers, lasers <class-ref scheme="cpc">H01S</class-ref>; circuits capable of acting both as modulator and demodulator <class-ref scheme="cpc">H03C</class-ref>; details applicable to both modulators and frequency-changers <class-ref scheme="cpc">H03C</class-ref>; demodulating pulses <class-ref scheme="cpc">H03K9/00</class-ref>; transforming types of pulse modulation <class-ref scheme="cpc">H03K11/00</class-ref>; coding, decoding or code conversion, in general <class-ref scheme="cpc">H03M</class-ref>; repeater stations <class-ref scheme="cpc">H04B7/14</class-ref>; demodulators adapted for ac systems of digital information transmission <class-ref scheme="cpc">H04L27/00</class-ref>; synchronous demodulators adapted for colour television <class-ref scheme="cpc">H04N9/66</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> only: <subnote type="bullet"><note-paragraph>demodulation or transference of signals modulated on a sinusoidal carrier or on electromagnetic waves; </note-paragraph><note-paragraph>comparing phase or frequency of two mutually-independent oscillations.</note-paragraph></subnote></note-paragraph></note><note type="warning"><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>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H03D1/00" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D1/00" definition-exists="true" ipc-concordant="H03D1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Demodulation of amplitude-modulated oscillations </text><reference><text><class-ref scheme="cpc">H03D5/00</class-ref>, <class-ref scheme="cpc">H03D9/00</class-ref>, <class-ref scheme="cpc">H03D11/00</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/02" definition-exists="false" ipc-concordant="H03D1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D1/04" definition-exists="true" ipc-concordant="H03D1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of demodulators to reduce interference by undesired signals</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="H03D1/06" definition-exists="false" ipc-concordant="H03D1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of demodulators to reduce distortion, e.g. by negative feedback</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/08" definition-exists="true" ipc-concordant="H03D1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of non-linear two-pole elements </text><reference><text><class-ref scheme="cpc">H03D1/22</class-ref>, <class-ref scheme="cpc">H03D1/26</class-ref>, <class-ref scheme="cpc">H03D1/28</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D1/10" definition-exists="false" ipc-concordant="H03D1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of diodes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D1/12" definition-exists="false" ipc-concordant="H03D1/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with provision for equalising ac and dc loads</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/14" definition-exists="true" ipc-concordant="H03D1/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of non-linear elements having more than two poles </text><reference><text><class-ref scheme="cpc">H03D1/22</class-ref>, <class-ref scheme="cpc">H03D1/26</class-ref>, <class-ref scheme="cpc">H03D1/28</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D1/16" definition-exists="false" ipc-concordant="H03D1/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of discharge tubes</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="H03D1/18" definition-exists="true" ipc-concordant="H03D1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of semiconductor devices</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="H03D1/20" definition-exists="false" ipc-concordant="H03D1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with provision for preventing undesired type of demodulation, e.g. preventing anode detection in a grid detection circuit</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/22" definition-exists="true" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Homodyne or synchrodyne circuits </text><CPC-specific-text><reference><text>receiver circuits <class-ref scheme="cpc">H04B1/30</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D1/2209" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders</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="H03D1/2218" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using diodes for the decoding</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D1/2227" definition-exists="true" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using switches for the decoding </text><reference><text>diodes used as switches <class-ref scheme="cpc">H03D1/2218</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D1/2236" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2236</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a phase locked loop</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="9" additional-only="false" sort-key="H03D1/2245" definition-exists="true" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2245</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two quadrature channels </text><reference><text><class-ref scheme="cpc">H03D1/2209</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="10" additional-only="false" sort-key="H03D1/2254" definition-exists="true" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2254</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and a phase locked loop</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03D1/2263" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2001/2263</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>including a counter or a divider in the PLL</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D1/2272" definition-exists="true" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2272</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using FET's </text><reference><text><class-ref scheme="cpc">H03D1/2209</class-ref>, <class-ref scheme="cpc">H03D1/2245</class-ref> and <class-ref scheme="cpc">H03D1/2281</class-ref> take precedence</text></reference></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="H03D1/2281" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/2281</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a phase locked loop </text><reference><text><class-ref scheme="cpc">H03D1/2236</class-ref> and <class-ref scheme="cpc">H03D1/2254</class-ref> take precedence</text></reference></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="H03D1/229" definition-exists="false" ipc-concordant="H03D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D1/229</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>using at least a two emittor-coupled differential pair of transistors </text><reference><text><class-ref scheme="cpc">H03D1/2209</class-ref> - <class-ref scheme="cpc">H03D1/2281</class-ref> take precedence</text></reference></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="H03D1/24" definition-exists="true" ipc-concordant="H03D1/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for demodulation of signals wherein one sideband or the carrier has been wholly or partially suppressed </text><CPC-specific-text><reference><text>receiver circuits <class-ref scheme="cpc">H04B1/302</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/26" definition-exists="false" ipc-concordant="H03D1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of transit-time tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D1/28" definition-exists="true" ipc-concordant="H03D1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by deflecting an electron beam in a discharge tube </text><reference><text><class-ref scheme="cpc">H03D1/26</class-ref> takes precedence</text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D3/00" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Demodulation of angle-, </text><CPC-specific-text><text>frequency- or phase-</text></CPC-specific-text><text> modulated oscillations </text><reference><text><class-ref scheme="cpc">H03D5/00</class-ref>, <class-ref scheme="cpc">H03D9/00</class-ref>, <class-ref scheme="cpc">H03D11/00</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/001" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of arrangements applicable to more than one type of frequency demodulator </text><reference><text><class-ref scheme="cpc">H03D3/28</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="9" additional-only="false" sort-key="H03D3/002" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Modifications of demodulators to reduce interference by undesired signals </text><reference><text><class-ref scheme="cpc">H03D3/248</class-ref> takes precedence</text></reference></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="H03D3/003" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements for reducing frequency deviation, e.g. by negative frequency feedback </text><reference><text>combined with a phase locked loop demodulator <class-ref scheme="cpc">H03D3/242</class-ref>; changing frequency deviation for modulators <class-ref scheme="cpc">H03C3/06</class-ref></text></reference></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="H03D3/004" definition-exists="false" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein the demodulated signal is used for controlling an oscillator, e.g. the local oscillator</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/005" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>wherein the demodulated signal is used for controlling a bandpass filter </text><reference><text>automatic bandwidth control <class-ref scheme="cpc">H03G</class-ref>; automatic frequency control <class-ref scheme="cpc">H03J7/02</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/006" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by sampling the oscillations and further processing the samples, e.g. by computing techniques </text><reference><text><class-ref scheme="cpc">H03D3/007</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/007" definition-exists="true" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by converting the oscillations into two quadrature related signals </text><reference><text><class-ref scheme="cpc">H03D3/245</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="9" additional-only="false" sort-key="H03D3/008" definition-exists="false" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensating DC offsets</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="H03D3/009" definition-exists="false" ipc-concordant="H03D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compensating quadrature phase or amplitude imbalances</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="8" additional-only="false" sort-key="H03D3/02" definition-exists="true" ipc-concordant="H03D3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D3/02</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>by detecting phase difference between two signals obtained from input signal </text><reference><text><class-ref scheme="cpc">H03D3/28</class-ref> - <class-ref scheme="cpc">H03D3/32</class-ref> take precedence; </text><CPC-specific-text><text>muting in frequency-modulation receivers <class-ref scheme="cpc">H03G3/28</class-ref></text></CPC-specific-text><text>; limiting arrangements <class-ref scheme="cpc">H03G11/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D3/04" definition-exists="true" ipc-concordant="H03D3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by counting or integrating cycles of oscillations </text><CPC-specific-text><reference><text>arrangements for measuring frequencies <class-ref scheme="cpc">G01R23/10</class-ref></text></reference></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="H03D3/06" definition-exists="false" ipc-concordant="H03D3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by combining signals additively or in product demodulators</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/08" definition-exists="false" ipc-concordant="H03D3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of diodes, e.g. Foster-Seeley discriminator</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03D3/10" definition-exists="false" ipc-concordant="H03D3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in which the diodes are simultaneously conducting during the same half period of the signal, e.g. radio detector</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/12" definition-exists="false" ipc-concordant="H03D3/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of discharge tubes having more than two electrodes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/14" definition-exists="false" ipc-concordant="H03D3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of semiconductor devices having more than two electrodes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/16" definition-exists="false" ipc-concordant="H03D3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of electromechanical resonators</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D3/18" definition-exists="false" ipc-concordant="H03D3/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of synchronous gating arrangements</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/20" definition-exists="false" ipc-concordant="H03D3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>producing pulses whose amplitude or duration depends on phase difference</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D3/22" definition-exists="false" ipc-concordant="H03D3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector</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="H03D3/24" definition-exists="false" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D3/241" definition-exists="false" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/241</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the oscillator being part of a phase locked loop</text></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="H03D3/242" definition-exists="false" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/242</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>combined with means for controlling the frequency of a further oscillator, e.g. for negative frequency feedback or AFC</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03D3/244" definition-exists="false" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/244</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>combined with means for obtaining automatic gain control</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03D3/245" definition-exists="true" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/245</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using at least twophase detectors in the loop </text><reference><text><class-ref scheme="cpc">H03D3/244</class-ref> takes precedence; in general <class-ref scheme="cpc">H03L7/087</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03D3/247" definition-exists="true" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/247</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a controlled phase shifter </text><reference><text>in general <class-ref scheme="cpc">H03L7/081</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03D3/248" definition-exists="true" ipc-concordant="H03D3/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/248</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means for eliminating interfering signals, e.g. by multiple phase locked loops </text><reference><text>multiple loops in general <class-ref scheme="cpc">H03L7/07</class-ref>, <class-ref scheme="cpc">H03L7/22</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/26" definition-exists="true" ipc-concordant="H03D3/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D3/26</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>by means of sloping amplitude/frequency characteristic of tuned or reactive circuit </text><reference><text><class-ref scheme="cpc">H03D3/28</class-ref> - <class-ref scheme="cpc">H03D3/32</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/28" definition-exists="true" ipc-concordant="H03D3/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of demodulators to reduce effects of temperature variations </text><reference><CPC-specific-text><text>automatic frequency regulation in receivers <class-ref scheme="cpc">H03J</class-ref></text></CPC-specific-text><text>; automatic frequency control <class-ref scheme="cpc">H03L</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/30" definition-exists="false" ipc-concordant="H03D3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of transit-time tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/32" definition-exists="true" ipc-concordant="H03D3/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by deflecting an electron beam in a discharge tube </text><reference><text><class-ref scheme="cpc">H03D3/30</class-ref> takes precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D3/34" definition-exists="true" ipc-concordant="H03D3/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D3/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of electromechanical devices </text><reference><text><class-ref scheme="cpc">H03D3/16</class-ref> takes precedence</text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D5/00" definition-exists="true" ipc-concordant="H03D5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will </text><reference><text><class-ref scheme="cpc">H03D9/00</class-ref>, <class-ref scheme="cpc">H03D11/00</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D7/00" definition-exists="true" ipc-concordant="H03D7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transference of modulation from one carrier to another, e.g. frequency-changing </text><reference><text><class-ref scheme="cpc">H03D9/00</class-ref>, <class-ref scheme="cpc">H03D11/00</class-ref> take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers <class-ref scheme="cpc">H03F</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/005" definition-exists="false" ipc-concordant="H03D7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of superconductive devices</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/02" definition-exists="true" ipc-concordant="H03D7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D7/02</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>by means of diodes </text><reference><text><class-ref scheme="cpc">H03D7/14</class-ref> - <class-ref scheme="cpc">H03D7/22</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D7/04" definition-exists="false" ipc-concordant="H03D7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having </text><CPC-specific-text><text>a partially</text></CPC-specific-text><text> negative resistance characteristic, e.g. tunnel diode</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/06" definition-exists="true" ipc-concordant="H03D7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D7/06</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>by means of discharge tubes having more than two electrodes </text><reference><text><class-ref scheme="cpc">H03D7/14</class-ref> - <class-ref scheme="cpc">H03D7/22</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D7/08" definition-exists="false" ipc-concordant="H03D7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the signals to be mixed being applied between the same two electrodes</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="H03D7/10" definition-exists="false" ipc-concordant="H03D7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the signals to be mixed being applied between different pairs of electrodes</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/12" definition-exists="true" ipc-concordant="H03D7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03D7/12</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>by means of semiconductor devices having more than two electrodes </text><reference><text><class-ref scheme="cpc">H03D7/14</class-ref> - <class-ref scheme="cpc">H03D7/22</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D7/125" definition-exists="false" ipc-concordant="H03D7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/125</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></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/14" definition-exists="true" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Balanced arrangements</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D7/1408" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with diodes</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="H03D7/1416" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1416</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with discharge tubes having more than two electrodes</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="H03D7/1425" definition-exists="true" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03D7/1425</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with 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="H03D7/1433" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1433</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using bipolar transistors </text><reference><text><class-ref scheme="cpc">H03D7/145</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1441" definition-exists="true" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1441</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using field-effect transistors </text><reference><text><class-ref scheme="cpc">H03D7/145</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/145" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a combination of bipolar transistors and field-effect transistors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1458" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1458</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Double balanced arrangements, i.e. where both input signals are differential</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1466" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1466</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Passive mixer arrangements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1475" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1475</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Subharmonic mixer arrangements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1483" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1483</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising components for selecting a particular frequency component of the output</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D7/1491" definition-exists="false" ipc-concordant="H03D7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/1491</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Arrangements to linearise a transconductance stage of a mixer arrangement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/16" definition-exists="true" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multiple-frequency-changing</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D7/161" definition-exists="false" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/161</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>all the frequency changers being connected in cascade</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="H03D7/163" definition-exists="false" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the local oscillations of at least two of the frequency changers being derived from a single oscillator</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="9" additional-only="false" sort-key="H03D7/165" definition-exists="true" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature </text><reference><text>combined with amplitude demodulation <class-ref scheme="cpc">H03D1/2245</class-ref>, combined with angle demodulation <class-ref scheme="cpc">H03D3/007</class-ref>; N-path filters <class-ref scheme="cpc">H03H19/002</class-ref></text></reference></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="H03D7/166" definition-exists="false" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two or more quadrature frequency translation stages</text></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="H03D7/168" definition-exists="false" ipc-concordant="H03D7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/168</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a feedback loop containing mixers or demodulators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/18" definition-exists="true" ipc-concordant="H03D7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of frequency-changers for eliminating image frequencies </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03D7/16</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/20" definition-exists="false" ipc-concordant="H03D7/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of transit-time tubes</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D7/22" definition-exists="true" ipc-concordant="H03D7/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D7/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by deflecting an electron beam in a discharge tube </text><reference><text><class-ref scheme="cpc">H03D7/20</class-ref> takes precedence</text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D9/00" definition-exists="true" ipc-concordant="H03D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Demodulation or transference of modulation of modulated electromagnetic waves </text><reference><text>demodulating light, transferring modulation in light waves <class-ref scheme="cpc">G02F2/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D9/02" definition-exists="true" ipc-concordant="H03D9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Demodulation using distributed inductance and capacitance, e.g. in feeder lines</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D9/04" definition-exists="false" ipc-concordant="H03D9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for angle-modulated oscillations</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D9/06" definition-exists="true" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Transference of modulation using distributed inductance and capacitance</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D9/0608" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of diodes</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="H03D9/0616" definition-exists="true" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0616</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>mounted in a hollow waveguide </text><reference><text><class-ref scheme="cpc">H03D9/0641</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D9/0625" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0625</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>mounted in a coaxial resonator structure</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D9/0633" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0633</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>mounted on a stripline circuit</text></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="H03D9/0641" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0641</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>located in a hollow waveguide</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D9/065" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of discharge tubes having more than two electrodes</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="H03D9/0658" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0658</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of semiconductor devices having more than two electrodes</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="H03D9/0666" definition-exists="true" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0666</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using bipolar transistors </text><reference><text><class-ref scheme="cpc">H03D9/0683</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D9/0675" definition-exists="true" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using field effect transistors </text><reference><text><class-ref scheme="cpc">H03D9/0683</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03D9/0683" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D9/0683</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a combination of bipolar transistors and field effect transistors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D9/0691" definition-exists="false" ipc-concordant="H03D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2009/0691</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of superconductive devices</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D11/00" definition-exists="true" ipc-concordant="H03D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Super-regenerative demodulator circuits </text><CPC-specific-text><reference><text>applications in responders <class-ref scheme="cpc">G01S</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D11/02" definition-exists="false" ipc-concordant="H03D11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for amplitude-modulated oscillations</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D11/04" definition-exists="true" ipc-concordant="H03D11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of semiconductor devices having more than two electrodes</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D11/06" definition-exists="false" ipc-concordant="H03D11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for angle-modulated oscillations</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D11/08" definition-exists="false" ipc-concordant="H03D11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of semiconductor devices having more than two electrodes</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D13/00" definition-exists="true" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03D13/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Circuits for comparing the phase or frequency of two mutually-independent oscillations </text><CPC-specific-text><reference><text>measuring phase <class-ref scheme="cpc">G01R25/00</class-ref>; phase-discriminators with yes/no output <class-ref scheme="cpc">G01R25/005</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03D13/001" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which a pulse counter is used followed by a conversion into an analog signal</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D13/002" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the counter being an up-down counter</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="8" additional-only="false" sort-key="H03D13/003" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which both oscillations are converted by logic means into pulses which are applied to filtering or integrating means</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D13/004" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the logic means delivering pulses at more than one terminal, e.g. up and down pulses</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="8" additional-only="false" sort-key="H03D13/005" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which one of the oscillations is, or is converted into, a signal having a special waveform, e.g. triangular</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D13/006" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and by sampling this signal by narrow pulses obtained from the second oscillation</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="8" additional-only="false" sort-key="H03D13/007" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by analog multiplication of the oscillations or by performing a similar analog operation on the oscillations</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03D13/008" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using transistors</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="H03D13/009" definition-exists="false" ipc-concordant="H03D13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D13/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using diodes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03D99/00" definition-exists="true" ipc-concordant="H03D99/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D99/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Subject matter not provided for in other groups of this subclass</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H03D200/00" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03D200/00" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by <class-ref scheme="cpc">H03D</class-ref></text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03D200/0001" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0001</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuit elements of demodulators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/0003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Rat race couplers</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="H03D200/0005" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0005</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Wilkinson power dividers or combiners</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="H03D200/0007" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0007</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dual gate field effect transistors</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="H03D200/0009" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Emitter or source coupled transistor pairs or long tail pairs</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="H03D200/0011" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0011</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diodes</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0013" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0013</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diodes connected in a ring configuration</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diodes connected in a star configuration</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/0017" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0017</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Intermediate frequency filter</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="H03D200/0019" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0019</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gilbert multipliers</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="H03D200/0021" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency multipliers</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="H03D200/0023" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0023</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Balun circuits</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="H03D200/0025" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0025</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain control circuits</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0027" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0027</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including arrangements for assuring the same gain in two paths</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/0029" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0029</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Loop circuits with controlled phase shift</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="H03D200/0031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>PLL circuits with quadrature locking, e.g. a Costas loop</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="H03D200/0033" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0033</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Current mirrors</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="H03D200/0035" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0035</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Digital multipliers and adders used for detection</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="H03D200/0037" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0037</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Diplexers</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="H03D200/0039" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0039</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Exclusive OR logic circuits</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03D200/0041" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0041</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Functional aspects of demodulators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/0043" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0043</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bias and operating point</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="H03D200/0045" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0045</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Calibration of demodulators</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="H03D200/0047" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0047</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Offset of DC voltage or frequency</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="H03D200/0049" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0049</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Analog multiplication for detection</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="H03D200/005" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Analog to digital conversion</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="H03D200/0052" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0052</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Digital to analog conversion</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="H03D200/0054" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Digital filters</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0056" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a digital decimation filter</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0058" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0058</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a digital filter with interpolation</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Signal sampling</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0062" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0062</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Computation of input samples, e.g. successive samples</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/0064" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0064</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Detection of passages through null of a signal</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="H03D200/0066" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Mixing</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0068" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by computation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/007" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by using a logic circuit, e.g. flipflop, XOR</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0072" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by complex multiplication</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0074" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0074</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a resistive mixer or a passive mixer</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0076" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a distributed mixer</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0078" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a switched phase shifter or delay line</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03D200/008" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hilbert type transformation</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="H03D200/0082" definition-exists="true" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0082</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Quadrature arrangements</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="H03D200/0084" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0084</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Lowering the supply voltage and saving power</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="H03D200/0086" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction or prevention of harmonic frequencies</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="H03D200/0088" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0088</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of intermodulation, nonlinearities, adjacent channel interference</text></title-part><title-part><text>intercept points of harmonics or intermodulation products</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="H03D200/009" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of local oscillator or RF leakage</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="H03D200/0092" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Detection or reduction of fading in multipath transmission arrangements</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="H03D200/0094" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0094</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Measures to address temperature induced variations of demodulation</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0096" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0096</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by stabilising the temperature</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03D200/0098" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03D2200/0098</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by compensating temperature induced variations</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme> |