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244 lines
129 KiB
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244 lines
129 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="H03B" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>H03B</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER</text></title-part><title-part><text>GENERATION OF NOISE BY SUCH CIRCUITS </text><reference><text>measuring, testing <class-ref scheme="cpc">G01R</class-ref>; generators adapted for electrophonic musical instruments <class-ref scheme="cpc">G10H</class-ref>; Speech synthesis <class-ref scheme="cpc">G10L</class-ref>; masers, lasers <class-ref scheme="cpc">H01S</class-ref>; dynamo-electric machines <class-ref scheme="cpc">H02K</class-ref>; power inverter circuits <class-ref scheme="cpc">H02M</class-ref>; by using pulse techniques <class-ref scheme="cpc">H03K</class-ref>; automatic control of generators <class-ref scheme="cpc">H03L</class-ref>; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified <class-ref scheme="cpc">H03L</class-ref>; generation of oscillations in plasma <class-ref scheme="cpc">H05H</class-ref></text></reference></title-part></class-title><notes-and-warnings><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="H03B1/00" date-revised="2013-01-01" status="published"><classification-symbol>H03B1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03B1/00" definition-exists="true" ipc-concordant="H03B1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B1/00</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="8" additional-only="false" sort-key="H03B1/02" definition-exists="true" ipc-concordant="H03B1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Structural details of power oscillators, e.g. for heating </text><CPC-specific-text><reference><text>construction of transmitters <class-ref scheme="cpc">H04B</class-ref>; features of generators for heating by electromagnetic fields <class-ref scheme="cpc">H05B6/00</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="8" additional-only="false" sort-key="H03B1/04" definition-exists="false" ipc-concordant="H03B1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reducing undesired oscillations, e.g. harmonics</text></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="H03B5/00" definition-exists="true" ipc-concordant="H03B5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using amplifier with regenerative feedback from output to input </text><reference><text><class-ref scheme="cpc">H03B9/00</class-ref>, <class-ref scheme="cpc">H03B15/00</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="H03B5/02" definition-exists="false" ipc-concordant="H03B5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/02</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="H03B5/04" definition-exists="true" ipc-concordant="H03B5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature</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="H03B5/06" definition-exists="false" ipc-concordant="H03B5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of generator to ensure starting of 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="H03B5/08" definition-exists="false" ipc-concordant="H03B5/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element comprising lumped 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="H03B5/10" definition-exists="true" ipc-concordant="H03B5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being vacuum tube </text><reference><text><class-ref scheme="cpc">H03B5/14</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="9" additional-only="false" sort-key="H03B5/12" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03B5/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being semiconductor device </text><reference><text><class-ref scheme="cpc">H03B5/14</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B5/1203" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier being a single transistor</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="H03B5/1206" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using multiple transistors for amplification</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="H03B5/1209" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03B5/1209</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>the amplifier having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a long-tailed pair. </text><reference><text><class-ref scheme="cpc">H03B5/1215</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="11" additional-only="false" sort-key="H03B5/1212" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1212</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1215" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair</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="11" additional-only="false" sort-key="H03B5/1218" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the generator being of the balanced type</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="H03B5/1221" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier comprising multiple amplification stages connected in cascade</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="H03B5/1225" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the generator comprising multiple amplifiers connected in parallel</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="10" additional-only="false" sort-key="H03B5/1228" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier comprising one or more 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="H03B5/1231" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier comprising one or more bipolar 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="H03B5/1234" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1234</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and comprising means for varying the output amplitude of the generator </text><reference><text><class-ref scheme="cpc">H03B5/1278</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="H03B5/1237" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1237</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising means for varying the frequency of the generator</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="H03B5/124" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/124</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means comprising a voltage dependent capacitance</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1243" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1243</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means comprising voltage variable capacitance diodes</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1246" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1246</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means comprising transistors used to provide a variable capacitance</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03B5/125" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the transistors being bipolar transistors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03B5/1253" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1253</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the transistors being field-effect transistors</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="11" additional-only="false" sort-key="H03B5/1256" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1256</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means comprising a variable inductance</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1259" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03B5/1259</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>the means comprising a variable active inductor, e.g. gyrator circuits</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="11" additional-only="false" sort-key="H03B5/1262" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1262</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means comprising switched elements</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1265" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1265</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>switched capacitors</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1268" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1268</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>switched inductors</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="11" additional-only="false" sort-key="H03B5/1271" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03B5/1271</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>the frequency being controlled by a control current, i.e. current controlled oscillators</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="H03B5/1275" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1275</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having further means for varying a parameter in dependence on the frequency</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1278" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1278</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the parameter being an amplitude of a signal, e.g. maintaining a constant output amplitude over the frequency range</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1281" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1281</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the parameter being the amount of feedback</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1284" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1284</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the parameter being another frequency, e.g. a harmonic of the oscillating frequency</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/1287" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1287</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the parameter being a quality factor, e.g. Q factor of the frequency determining element</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/129" definition-exists="false" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/129</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the parameter being a bias voltage or a power supply</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="11" additional-only="false" sort-key="H03B5/1293" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03B5/1293</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>having means for achieving a desired tuning characteristic, e.g. linearising the frequency characteristic across the tuning voltage range</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="10" additional-only="false" sort-key="H03B5/1296" definition-exists="true" ipc-concordant="H03B5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1296</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the feedback circuit comprising a transformer</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="H03B5/14" definition-exists="false" ipc-concordant="H03B5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B5/16" definition-exists="false" ipc-concordant="H03B5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being vacuum tube</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="H03B5/18" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element comprising 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="H03B5/1805" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1805</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency-determining element being a coaxial resonator</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="H03B5/1811" definition-exists="true" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1811</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a vacuum tube </text><reference><text><u>see</u> provisionally also <class-ref scheme="cpc">H03B5/1835</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="9" additional-only="false" sort-key="H03B5/1817" definition-exists="true" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1817</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency-determining element being a cavity resonator</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="H03B5/1823" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1823</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a semiconductor device</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="H03B5/1829" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1829</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the semiconductor device being a field-effect device</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="10" additional-only="false" sort-key="H03B5/1835" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1835</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a vacuum tube</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="H03B5/1841" definition-exists="true" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1841</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency-determining element being a strip line resonator </text><reference><text><class-ref scheme="cpc">H03B5/1805</class-ref>, <class-ref scheme="cpc">H03B5/1817</class-ref>, <class-ref scheme="cpc">H03B5/1864</class-ref> and <class-ref scheme="cpc">H03B5/1882</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B5/1847" definition-exists="true" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1847</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a semiconductor device</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="H03B5/1852" definition-exists="true" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1852</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the semiconductor device being a field-effect device</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="10" additional-only="false" sort-key="H03B5/1858" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1858</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a vacuum tube </text><reference><text><u>see</u> provisionally also <class-ref scheme="cpc">H03B5/1835</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="9" additional-only="false" sort-key="H03B5/1864" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1864</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency-determining element being a dielectric resonator</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="H03B5/187" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/187</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a semiconductor device</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="H03B5/1876" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1876</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the semiconductor device being a field-effect device</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="H03B5/1882" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1882</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency-determining element being a magnetic-field sensitive resonator, e.g. a Yttrium Iron Garnet or a magnetostatic surface wave resonator</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="H03B5/1888" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1888</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the active element in the amplifier being a semiconductor device</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="H03B5/1894" definition-exists="false" ipc-concordant="H03B5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/1894</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the semiconductor device being a field-effect device</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="H03B5/20" definition-exists="false" ipc-concordant="H03B5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B5/22" definition-exists="true" ipc-concordant="H03B5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being vacuum tube </text><reference><text><class-ref scheme="cpc">H03B5/26</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="9" additional-only="false" sort-key="H03B5/24" definition-exists="true" ipc-concordant="H03B5/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being semiconductor device </text><reference><text><class-ref scheme="cpc">H03B5/26</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="9" additional-only="false" sort-key="H03B5/26" definition-exists="true" ipc-concordant="H03B5/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted</text></title-part><title-part><text>frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B5/28" definition-exists="false" ipc-concordant="H03B5/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being vacuum tube</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="H03B5/30" definition-exists="false" ipc-concordant="H03B5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element being electromechanical resonator</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B5/32" definition-exists="true" ipc-concordant="H03B5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H03B5/32</classification-symbol><class-title date-revised="2023-02-01"><title-part><text>being a piezo-electric resonator </text><reference><text>selection of piezo-electric material <class-ref scheme="cpc">H10N30/00</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B5/323" definition-exists="true" ipc-concordant="H03B5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/323</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the resonator having more than two terminals </text><reference><text><class-ref scheme="cpc">H03B5/326</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="H03B5/326" definition-exists="false" ipc-concordant="H03B5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/326</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the resonator being an acoustic wave device, e.g. SAW or BAW device</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="H03B5/34" definition-exists="true" ipc-concordant="H03B5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being vacuum tube </text><reference><text><class-ref scheme="cpc">H03B5/38</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="10" additional-only="false" sort-key="H03B5/36" definition-exists="true" ipc-concordant="H03B5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element in amplifier being semiconductor device </text><reference><CPC-specific-text><text><class-ref scheme="cpc">H03B5/323</class-ref>, <class-ref scheme="cpc">H03B5/326</class-ref></text></CPC-specific-text><text> , <class-ref scheme="cpc">H03B5/38</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03B5/362" definition-exists="true" ipc-concordant="H03B5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03B5/362</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>the amplifier being a single transistor </text><reference><text><class-ref scheme="cpc">H03B5/364</class-ref> - <class-ref scheme="cpc">H03B5/368</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="11" additional-only="false" sort-key="H03B5/364" definition-exists="true" ipc-concordant="H03B5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/364</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the amplifier comprising field effect transistors </text><reference><text><class-ref scheme="cpc">H03B5/366</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="11" additional-only="false" sort-key="H03B5/366" definition-exists="false" ipc-concordant="H03B5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and comprising means for varying the frequency by a variable voltage or current</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03B5/368" definition-exists="true" ipc-concordant="H03B5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/368</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the means being voltage variable capacitance 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="10" additional-only="false" sort-key="H03B5/38" definition-exists="false" ipc-concordant="H03B5/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>frequency-determining element being connected via bridge circuit to closed ring around which signal is transmitted</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="H03B5/40" definition-exists="true" ipc-concordant="H03B5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H03B5/40</classification-symbol><class-title date-revised="2023-02-01"><title-part><text>being a magnetostrictive resonator </text><reference><text><class-ref scheme="cpc">H03B5/42</class-ref> takes precedence; selection of magneto-strictive material </text><CPC-specific-text><text><class-ref scheme="cpc">H01F1/00</class-ref></text></CPC-specific-text><text>; <class-ref scheme="cpc">H10N30/00</class-ref></text></reference></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="H03B5/42" definition-exists="false" ipc-concordant="H03B5/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B5/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted</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="H03B7/00" definition-exists="true" ipc-concordant="H03B7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using active element having a negative resistance between two of its electrodes </text><reference><text><class-ref scheme="cpc">H03B9/00</class-ref> takes 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="H03B7/02" definition-exists="false" ipc-concordant="H03B7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element comprising lumped 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="H03B7/04" definition-exists="false" ipc-concordant="H03B7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element being vacuum tube</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="H03B7/06" definition-exists="true" ipc-concordant="H03B7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element being semiconductor device</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B7/08" definition-exists="true" ipc-concordant="H03B7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being a tunnel diode</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="H03B7/10" definition-exists="false" ipc-concordant="H03B7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element being gas-discharge or arc-discharge tube</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="H03B7/12" definition-exists="false" ipc-concordant="H03B7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with frequency-determining element comprising 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="H03B7/14" definition-exists="true" ipc-concordant="H03B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>active element being semiconductor device</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B7/143" definition-exists="false" ipc-concordant="H03B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and which comprises an element depending on a voltage or a magnetic field, e.g. varactor- YIG</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="H03B7/146" definition-exists="false" ipc-concordant="H03B7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B7/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with several semiconductor devices</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="7" additional-only="false" sort-key="H03B9/00" definition-exists="true" ipc-concordant="H03B9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using transit-time effects </text><CPC-specific-text><reference><text>construction of tube and circuit arrangements not adapted to a particular application <class-ref scheme="cpc">H01J</class-ref>; construction of the semiconductor devices <class-ref scheme="cpc">H01L</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="H03B9/01" definition-exists="false" ipc-concordant="H03B9/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using discharge tubes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B9/02" definition-exists="true" ipc-concordant="H03B9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a retarding-field tube </text><reference><text>using klystrons <class-ref scheme="cpc">H03B9/04</class-ref></text></reference></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="H03B9/04" definition-exists="false" ipc-concordant="H03B9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a klystron</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B9/06" definition-exists="false" ipc-concordant="H03B9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a reflex klystron</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="H03B9/08" definition-exists="false" ipc-concordant="H03B9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a travelling-wave tube</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="H03B9/10" definition-exists="false" ipc-concordant="H03B9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a magnetron</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="H03B9/12" definition-exists="true" ipc-concordant="H03B9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using solid state devices, e.g. Gunn-effect devices</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B9/123" definition-exists="false" ipc-concordant="H03B9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2009/123</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using Gunn diodes</text></CPC-specific-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="H03B9/126" definition-exists="false" ipc-concordant="H03B9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2009/126</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using impact ionization avalanche transit time [IMPATT] 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="H03B9/14" definition-exists="false" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>and elements comprising distributed inductance and capacitance</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B9/141" definition-exists="false" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and comprising a voltage sensitive element, e.g. varactor</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="H03B9/142" definition-exists="false" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/142</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and comprising a magnetic field sensitive element, e.g. YIG</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="H03B9/143" definition-exists="false" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using more than one solid state device</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="H03B9/145" definition-exists="true" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03B9/145</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>the frequency being determined by a cavity resonator, e.g. a hollow waveguide cavity or a coaxial cavity </text><reference><text><class-ref scheme="cpc">H03B9/141</class-ref> - <class-ref scheme="cpc">H03B9/143</class-ref>, <class-ref scheme="cpc">H03B9/147</class-ref>, <class-ref scheme="cpc">H03B9/148</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03B9/146" definition-exists="false" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B9/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>formed by a disc, e.g. a waveguide cap resonator</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="10" additional-only="false" sort-key="H03B9/147" definition-exists="true" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03B9/147</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>the frequency being determined by a stripline resonator </text><reference><text><class-ref scheme="cpc">H03B9/141</class-ref> - <class-ref scheme="cpc">H03B9/143</class-ref>, <class-ref scheme="cpc">H03B9/148</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="10" additional-only="false" sort-key="H03B9/148" definition-exists="true" ipc-concordant="H03B9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03B9/148</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>the frequency being determined by a dielectric resonator </text><reference><text><class-ref scheme="cpc">H03B9/141</class-ref> - <class-ref scheme="cpc">H03B9/143</class-ref> take precedence</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="7" additional-only="false" sort-key="H03B11/00" definition-exists="true" ipc-concordant="H03B11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using a shock-excited tuned circuit </text><reference><text>with feedback <class-ref scheme="cpc">H03B5/00</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="H03B11/02" definition-exists="true" ipc-concordant="H03B11/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>excited by spark </text><reference><text>spark gaps therefor <class-ref scheme="cpc">H01T9/00</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="H03B11/04" definition-exists="false" ipc-concordant="H03B11/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>excited by interrupter</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B11/06" definition-exists="false" ipc-concordant="H03B11/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by mechanical interrupter</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="H03B11/08" definition-exists="false" ipc-concordant="H03B11/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>interrupter being discharge tube</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="H03B11/10" definition-exists="false" ipc-concordant="H03B11/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B11/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>interrupter being semiconductor device</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="H03B13/00" definition-exists="true" ipc-concordant="H03B13/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B13/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using deflection of electron beam in a cathode-ray tube</text></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="H03B15/00" definition-exists="true" ipc-concordant="H03B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-01-01" status="published"><classification-symbol>H03B15/00</classification-symbol><class-title date-revised="2018-01-01"><title-part><text>Generation of oscillations using galvano-magnetic devices, e.g. Hall-effect devices, or using superconductivity effects</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03B15/003" definition-exists="false" ipc-concordant="H03B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H03B15/003</classification-symbol><class-title date-revised="2023-02-01"><title-part><CPC-specific-text><text>using superconductivity effects </text><reference><text>devices using superconductivity <class-ref scheme="cpc">H10N60/00</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="8" additional-only="false" sort-key="H03B15/006" definition-exists="false" ipc-concordant="H03B15/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B15/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using spin transfer effects or giant magnetoresistance</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="7" additional-only="false" sort-key="H03B17/00" definition-exists="true" ipc-concordant="H03B17/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B17/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations using radiation source and detector, e.g. with interposed variable obturator</text></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="H03B19/00" definition-exists="true" ipc-concordant="H03B19/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source </text><reference><text>transference of modulation from one carrier to another <class-ref scheme="cpc">H03D7/00</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="H03B19/03" definition-exists="false" ipc-concordant="H03B19/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using non-linear inductance</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="H03B19/05" definition-exists="false" ipc-concordant="H03B19/05" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using non-linear capacitance, e.g. varactor diodes</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="H03B19/06" definition-exists="false" ipc-concordant="H03B19/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of discharge device or semiconductor device with more than two electrodes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B19/08" definition-exists="false" ipc-concordant="H03B19/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of a discharge device</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03B19/10" definition-exists="false" ipc-concordant="H03B19/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using multiplication only</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="H03B19/12" definition-exists="false" ipc-concordant="H03B19/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using division only</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="H03B19/14" definition-exists="false" ipc-concordant="H03B19/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by means of a semiconductor device</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="H03B19/16" definition-exists="false" ipc-concordant="H03B19/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B19/18" definition-exists="false" ipc-concordant="H03B19/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>and elements comprising distributed inductance and capacitance</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="H03B19/20" definition-exists="false" ipc-concordant="H03B19/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B19/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>being diodes exhibiting charge storage or enhancement effects</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="H03B21/00" definition-exists="true" ipc-concordant="H03B21/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B21/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations by combining unmodulated signals of different frequencies </text><reference><text><class-ref scheme="cpc">H03B19/00</class-ref> takes precedence; frequency changing circuits in general <class-ref scheme="cpc">H03D</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="H03B21/01" definition-exists="true" ipc-concordant="H03B21/01" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B21/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by beating unmodulated signals of different frequencies</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03B21/02" definition-exists="true" ipc-concordant="H03B21/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H03B21/02</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>by plural beating, i.e. for frequency synthesis </text><CPC-specific-text><text>; Beating in combination with multiplication or division of frequency </text><reference><text>digital frequency synthesis using a ROM <class-ref scheme="cpc">G06F1/02</class-ref>; digital frequency synthesis in general <class-ref scheme="cpc">H03K</class-ref>; indirect frequency synthesis using a PLL <class-ref scheme="cpc">H03L7/16</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="H03B21/025" definition-exists="false" ipc-concordant="H03B21/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B21/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by repeated mixing in combination with division of frequency only</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="H03B21/04" definition-exists="false" ipc-concordant="H03B21/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2014-02-04" status="published"><classification-symbol>H03B21/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using several similar stages</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="H03B23/00" definition-exists="true" ipc-concordant="H03B23/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B23/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations periodically swept over a predetermined frequency range </text><reference><text>angle-modulating circuits in general <class-ref scheme="cpc">H03C3/00</class-ref></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="H03B25/00" definition-exists="true" ipc-concordant="H03B25/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B25/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Simultaneous generation by a free-running oscillator of oscillations having different frequencies</text></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="H03B27/00" definition-exists="true" ipc-concordant="H03B27/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B27/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs</text></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="H03B28/00" definition-exists="true" ipc-concordant="H03B28/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03B28/00</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Generation of oscillations by methods not covered by groups <class-ref scheme="cpc">H03B5/00</class-ref> - <class-ref scheme="cpc">H03B27/00</class-ref>, including modification of the waveform to produce sinusoidal oscillations </text><reference><text>analogue function generators for performing computing operations <class-ref scheme="cpc">G06G7/26</class-ref>; use of transformers for conversion of waveform in ac-ac converters <class-ref scheme="cpc">H02M5/18</class-ref></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="H03B29/00" definition-exists="true" ipc-concordant="H03B29/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B29/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of noise currents and voltages </text><CPC-specific-text><reference><text>gasfilled discharge tubes with solid cathode specially adapted as noise generators <class-ref scheme="cpc">H01J17/005</class-ref></text></reference></CPC-specific-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="H03B200/00" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03B200/00" 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>H03B2200/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to details of oscillators covered by <class-ref scheme="cpc">H03B</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="H03B200/0002" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0002</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Types of oscillators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0004" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0004</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Butler oscillator</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="H03B200/0006" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Clapp oscillator</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="H03B200/0008" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0008</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Colpitts oscillator</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="H03B200/001" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hartley oscillator</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="H03B200/0012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pierce oscillator</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="H03B200/0014" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0014</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Structural aspects of oscillators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0016" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0016</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a ring, disk or loop shaped resonator</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="H03B200/0018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to the cutting angle of a crystal, e.g. AT cut quartz</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="H03B200/002" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>making use of ceramic material</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="H03B200/0022" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0022</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the substrate, e.g. material</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="H03B200/0024" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0024</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including parallel striplines</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="H03B200/0026" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0026</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to the pins of integrated 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="H03B200/0028" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0028</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>based on a monolithic microwave integrated circuit [MMIC]</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="H03B200/003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Circuit elements of oscillators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0032" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0032</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a device with a Schottky junction</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="H03B200/0034" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0034</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a buffer amplifier</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including an emitter or source coupled transistor pair or a long tail pair</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="H03B200/0038" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a current mirror</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="H03B200/004" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B200/0042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the capacitance diode being in the feedback path</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="H03B200/0044" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H03B2200/0044</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>including optical elements, e.g. optical injection locking</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="H03B200/0046" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0046</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including measures to switch the gain of an amplifier</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0048" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0048</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including measures to switch the frequency band, e.g. by harmonic selection</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="H03B200/005" 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>H03B2200/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including measures to switch a capacitor</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="H03B200/0052" 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>H03B2200/0052</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including measures to switch the feedback circuit</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="H03B200/0054" 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>H03B2200/0054</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including measures to switch a filter, e.g. for frequency tuning or for harmonic selection</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="H03B200/0056" 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>H03B2200/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including a diode used for switching</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="H03B200/0058" 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>H03B2200/0058</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with particular transconductance characteristics, e.g. an operational transconductance amplifier</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="H03B200/006" 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>H03B2200/006</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Functional aspects of oscillators</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B200/0062" 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>H03B2200/0062</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="H03B200/0064" 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>H03B2200/0064</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pulse width, duty cycle or on/off ratio</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="H03B200/0066" 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>H03B2200/0066</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplitude or AM 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="H03B200/0068" 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>H03B2200/0068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency or FM 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="H03B200/007" 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>H03B2200/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of oscillations based on harmonic frequencies, e.g. overtone oscillators</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="H03B200/0072" 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>H03B2200/0072</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Frequency hopping and enabling of rapid frequency changes</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="H03B200/0074" 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>H03B2200/0074</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Locking of an oscillator by injecting an input signal directly into the oscillator</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="H03B200/0076" 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>H03B2200/0076</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Power combination of several oscillators oscillating at the same 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="H03B200/0078" 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>H03B2200/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>generating or using signals in quadrature</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="H03B200/008" 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>H03B2200/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>making use of a reference 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="H03B200/0082" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2200/0082</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="H03B200/0084" 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>H03B2200/0084</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>dedicated to Terahertz 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="H03B200/0086" 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>H03B2200/0086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>relating to the Q factor or damping of the resonant circuit</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="H03B200/0088" 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>H03B2200/0088</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of noise</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B200/009" 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>H03B2200/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of phase noise</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="H03B200/0092" 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>H03B2200/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Measures to linearise or reduce distortion of oscillator characteristics</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="H03B200/0094" 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>H03B2200/0094</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Measures to ensure starting of oscillations</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="H03B200/0096" 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>H03B2200/0096</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Measures to ensure stopping of oscillations</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="H03B200/0098" 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>H03B2200/0098</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having a balanced output signal</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03B201/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aspects of oscillators relating to varying the frequency of the oscillations</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B201/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Varying the frequency of the oscillations by manual means</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B201/011" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/011</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being an element with a variable capacitance</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="H03B201/012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being an element with a variable inductance</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="H03B201/014" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/014</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being associated with an element comprising distributed inductances and capacitances</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B201/015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the element being a cavity</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="H03B201/017" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/017</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the element being a dielectric resonator</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="H03B201/018" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/018</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being a manual switch</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="H03B201/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Varying the frequency of the oscillations by electronic means</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B201/0208" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0208</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being an element with a variable capacitance, e.g. capacitance diode</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="H03B201/0216" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0216</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being an element with a variable inductance</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="H03B201/0225" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0225</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being associated with an element comprising distributed inductances and capacitances</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B201/0233" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0233</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the element being a cavity</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="H03B201/0241" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0241</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the element being a magnetically variable element, e.g. an Yttrium Iron Garnet</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="H03B201/025" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means being an electronic switch for switching in or out oscillator elements</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B201/0258" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0258</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means comprising a diode</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="H03B201/0266" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0266</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means comprising a transistor</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="H03B201/0275" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0275</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means delivering several selected voltages or currents</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B201/0283" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0283</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the means functioning digitally</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="11" additional-only="true" sort-key="H03B201/0291" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/0291</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>and being controlled by a processing device, e.g. a microprocessor</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B201/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Varying beside the frequency also another parameter of the oscillator in dependence on the frequency</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B201/031" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/031</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the parameter being the amplitude of a signal, e.g. maintaining a constant output amplitude over the frequency range</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="H03B201/033" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/033</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the parameter being the amount of feedback</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="H03B201/035" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/035</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the parameter being another frequency, e.g. a harmonic of the oscillating 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="H03B201/036" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/036</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the parameter being the quality factor of a resonator</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="H03B201/038" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2201/038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the parameter being a bias voltage or a power supply</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03B202/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aspects of oscillators relating to reduction of undesired oscillations</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B202/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations originated from distortion in one of the circuit elements of the oscillator</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B202/012" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/012</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element being the active device</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="H03B202/015" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/015</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element being a limiter</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="H03B202/017" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/017</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element being a frequency determining element</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="H03B202/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations originated from natural noise of the circuit elements of the oscillator</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B202/022" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/022</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the noise being essentially white noise, i.e. frequency independent noise</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="H03B202/025" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the noise being coloured noise, i.e. frequency dependent noise</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B202/027" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/027</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the noise being essentially proportional to the inverse of the frequency, i.e. the so-called 1/f noise</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B202/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations originated from internal parasitic couplings, i.e. parasitic couplings within the oscillator itself</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B202/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations originated from outside noise or interferences, e.g. from parasitic couplings with circuit elements outside the oscillator</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B202/042" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element belonging to the power supply</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="H03B202/044" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/044</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element belonging to transmitter circuitry</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="H03B202/046" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/046</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element belonging to receiver circuitry</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="H03B202/048" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/048</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the circuit element being a frequency divider</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="H03B202/05" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations through filtering or through special resonator characteristics</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B202/06" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations through modification of a bias voltage, e.g. selecting the operation point of an active device</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03B202/07" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations through a cancelling of the undesired oscillation</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B202/073" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/073</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by modifying the internal feedback of the oscillator</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="H03B202/076" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/076</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by using a feedback loop external to the oscillator, e.g. the so-called noise degeneration</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="H03B202/08" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Reduction of undesired oscillations originated from the oscillator in circuit elements external to the oscillator by means associated with the oscillator</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H03B202/082" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/082</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by avoiding coupling between these circuit elements</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="10" additional-only="true" sort-key="H03B202/084" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/084</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>through shielding</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="H03B202/086" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>through a frequency dependent coupling, e.g. which attenuates a certain frequency range</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="H03B202/088" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03B2202/088</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by compensating through additional couplings with these circuit elements</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item></class-scheme> |