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107 lines
61 KiB
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<?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="H03L" definition-exists="true" date-revised="2018-08-01" status="published"><classification-symbol>H03L</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES </text><reference><text>of dynamo-electric generators <class-ref scheme="cpc">H02P</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph>This subclass <u>covers</u>: <subnote type="bullet"><note-paragraph>automatic control circuits for generators of electronic oscillations or pulses; </note-paragraph><note-paragraph>starting, synchronisation, or stabilisation circuits for generators where the type of generator is irrelevant or unspecified.</note-paragraph></subnote></note-paragraph><note-paragraph>This subclass <u>does not cover</u> stabilisation or starting circuits specially adapted to only one specific type of generator, which are covered by subclasses <class-ref scheme="cpc">H03B</class-ref>, <class-ref scheme="cpc">H03K</class-ref>.</note-paragraph><note-paragraph>In this subclass, the following expression is used with the meaning indicated: <subnote type="bullet"><note-paragraph>"automatic control" covers only closed loop systems.</note-paragraph></subnote></note-paragraph></note><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H03L1/00" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H03L1/00" definition-exists="true" ipc-concordant="H03L1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stabilisation of generator output against variations of physical values, e.g. power supply </text><reference><text>automatic control <class-ref scheme="cpc">H03L5/00</class-ref>, <class-ref scheme="cpc">H03L7/00</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="H03L1/02" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>against variations of temperature only</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03L1/021" definition-exists="true" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of generators comprising distributed capacitance and inductance</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="H03L1/022" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature </text><reference><text><class-ref scheme="cpc">H03L1/021</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03L1/023" definition-exists="true" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using voltage variable capacitance diodes</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="H03L1/025" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and a memory for digitally storing correction values</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="H03L1/026" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a memory for digitally storing correction values </text><reference><text><class-ref scheme="cpc">H03L1/025</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="H03L1/027" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using frequency conversion means which is variable with temperature, e.g. mixer, frequency divider, pulse add/substract logic circuit </text><reference><text><class-ref scheme="cpc">H03L1/023</class-ref>, <class-ref scheme="cpc">H03L1/026</class-ref> take precedence</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="H03L1/028" definition-exists="false" ipc-concordant="H03L1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of generators comprising piezo-electric resonators </text><reference><text><class-ref scheme="cpc">H03L1/021</class-ref> and <class-ref scheme="cpc">H03L1/022</class-ref> take precedence; oscillation generators with a piezo-electric resonator <u>per se</u> <class-ref scheme="cpc">H03B5/32</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03L1/04" definition-exists="true" ipc-concordant="H03L1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Constructional details for maintaining temperature constant</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="H03L3/00" definition-exists="false" ipc-concordant="H03L3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L3/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Starting of generators</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="H03L5/00" definition-exists="true" ipc-concordant="H03L5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic control of voltage, current, or power</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H03L5/02" definition-exists="true" ipc-concordant="H03L5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of power</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="H03L7/00" definition-exists="true" ipc-concordant="H03L7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic control of frequency or phase</text></title-part><title-part><text>Synchronisation </text><reference><text>tuning of resonant circuits in general <class-ref scheme="cpc">H03J</class-ref>; synchronising in digital communication systems, <u>see</u> the relevant groups in class <class-ref scheme="cpc">H04</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="H03L7/02" definition-exists="true" ipc-concordant="H03L7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a frequency discriminator comprising a passive frequency-determining element</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03L7/04" definition-exists="true" ipc-concordant="H03L7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>wherein the frequency-determining element comprises distributed inductance and capacitance</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="H03L7/06" definition-exists="true" ipc-concordant="H03L7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a reference signal applied to a frequency- or phase-locked loop</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H03L7/07" definition-exists="true" ipc-concordant="H03L7/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using several loops, e.g. for redundant clock signal generation </text><reference><text>for indirect frequency synthesis <class-ref scheme="cpc">H03L7/22</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="H03L7/08" definition-exists="false" ipc-concordant="H03L7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details of the phase-locked loop</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03L7/0802" definition-exists="true" ipc-concordant="H03L7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0802</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the loop being adapted for reducing power consumption </text><reference><text><class-ref scheme="cpc">H03L7/14</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="H03L7/0805" definition-exists="false" ipc-concordant="H03L7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0805</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the loop being adapted to provide an additional control signal for use outside the loop</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="H03L7/0807" definition-exists="true" ipc-concordant="H03L7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0807</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>concerning mainly a recovery circuit for the reference signal</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="H03L7/081" definition-exists="true" ipc-concordant="H03L7/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/081</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>provided with an additional controlled phase shifter </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03L7/0998</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03L7/0812" definition-exists="true" ipc-concordant="H03L7/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/0812</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and where no voltage or current controlled oscillator is used</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="H03L7/0814" definition-exists="true" ipc-concordant="H03L7/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/0814</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the phase shifting device being digitally controlled</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="H03L7/0816" definition-exists="false" ipc-concordant="H03L7/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/0816</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the controlled phase shifter and the frequency- or phase-detection arrangement being connected to a common input</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="H03L7/0818" definition-exists="false" ipc-concordant="H03L7/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/0818</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the controlled phase shifter comprising coarse and fine delay or phase-shifting means</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="H03L7/083" definition-exists="true" ipc-concordant="H03L7/083" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/083</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the reference signal being additionally directly applied to the generator </text><reference><text>direct frequency synchronisation without loop <class-ref scheme="cpc">H03L7/24</class-ref></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="H03L7/085" definition-exists="true" ipc-concordant="H03L7/085" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal </text><reference><text><class-ref scheme="cpc">H03L7/10</class-ref> takes precedence; frequency or phase detection comparison in general <class-ref scheme="cpc">H03D3/00</class-ref>, <class-ref scheme="cpc">H03D13/00</class-ref></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="H03L7/087" definition-exists="false" ipc-concordant="H03L7/087" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/087</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using at least two phase detectors or a frequency and phase detector in the loop</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="H03L7/089" definition-exists="true" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/089</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the phase or frequency detector generating up-down pulses </text><reference><text><class-ref scheme="cpc">H03L7/087</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/0891" definition-exists="false" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0891</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the up-down pulses controlling source and sink current generators, e.g. a charge pump</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="H03L7/0893" definition-exists="true" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0893</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the up-down pulses controlling at least two source current generators or at least two sink current generators connected to different points in the loop</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="H03L7/0895" definition-exists="false" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0895</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of the current generators </text><reference><text><class-ref scheme="cpc">H03L7/0893</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03L7/0896" definition-exists="false" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0896</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the current generators being controlled by differential up-down pulses</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03L7/0898" definition-exists="true" ipc-concordant="H03L7/089" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0898</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the source or sink current values being variable </text><reference><text><class-ref scheme="cpc">H03L7/0896</class-ref> takes 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="11" additional-only="false" sort-key="H03L7/091" definition-exists="true" ipc-concordant="H03L7/091" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/091</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the phase or frequency detector using a sampling device </text><reference><text><class-ref scheme="cpc">H03L7/087</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="11" additional-only="false" sort-key="H03L7/093" definition-exists="true" ipc-concordant="H03L7/093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03L7/093</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>using special filtering or amplification characteristics in the loop </text><reference><text><class-ref scheme="cpc">H03L7/087</class-ref> - <class-ref scheme="cpc">H03L7/091</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03L7/095" definition-exists="true" ipc-concordant="H03L7/095" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/095</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a lock detector </text><reference><text><class-ref scheme="cpc">H03L7/087</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="11" additional-only="false" sort-key="H03L7/097" definition-exists="true" ipc-concordant="H03L7/097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/097</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a comparator for comparing the voltages obtained from two frequency to voltage converters</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="H03L7/099" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/099</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>concerning mainly the controlled oscillator of the loop</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03L7/0991" definition-exists="true" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0991</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider </text><reference><text><class-ref scheme="cpc">H03L7/0995</class-ref> takes precedence; fixed oscillators with means for selecting among various phases <class-ref scheme="cpc">H03L7/0814</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/0992" definition-exists="true" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0992</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a counter or a frequency divider</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="H03L7/0993" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0993</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>and a circuit for adding and deleting pulses</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/0994" definition-exists="true" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0994</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising an accumulator</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="H03L7/0995" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0995</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the oscillator comprising a ring oscillator</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="H03L7/0996" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0996</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selecting a signal among the plurality of phase-shifted signals produced by the ring oscillator</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="H03L7/0997" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/0997</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the number of delay elements connected in series in the ring oscillator</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="H03L7/0998" definition-exists="false" ipc-concordant="H03L7/099" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H03L7/0998</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using phase interpolation</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="H03L7/10" definition-exists="true" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for assuring initial synchronisation or for broadening the capture range</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03L7/101" definition-exists="false" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an additional control signal to the controlled loop oscillator derived from a signal generated in the loop </text><reference><text><class-ref scheme="cpc">H03L7/113</class-ref>, <class-ref scheme="cpc">H03L7/187</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="12" additional-only="false" sort-key="H03L7/102" definition-exists="false" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the additional signal being directly applied to the controlled loop oscillator</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="H03L7/103" definition-exists="false" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the additional signal being a digital signal</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="H03L7/104" definition-exists="false" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an additional signal from outside the loop for setting or controlling a parameter in the loop </text><reference><text><class-ref scheme="cpc">H03L7/107</class-ref>, <class-ref scheme="cpc">H03L7/12</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="H03L7/105" definition-exists="false" ipc-concordant="H03L7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Resetting the controlled oscillator when its frequency is outside a predetermined limit</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="H03L7/107" definition-exists="true" ipc-concordant="H03L7/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/107</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/1072" definition-exists="false" ipc-concordant="H03L7/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/1072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by changing characteristics of the charge pump, e.g. changing the gain</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="H03L7/1075" definition-exists="false" ipc-concordant="H03L7/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/1075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by changing characteristics of the loop filter, e.g. changing the gain, changing the bandwidth </text><reference><text><class-ref scheme="cpc">H03L7/1072</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="12" additional-only="false" sort-key="H03L7/1077" definition-exists="false" ipc-concordant="H03L7/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-02-01" status="published"><classification-symbol>H03L7/1077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by changing characteristics of the phase or frequency detection means </text><reference><text><class-ref scheme="cpc">H03L7/1072</class-ref> takes precedence</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="11" additional-only="false" sort-key="H03L7/113" definition-exists="false" ipc-concordant="H03L7/113" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/113</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using frequency discriminator</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="H03L7/12" definition-exists="false" ipc-concordant="H03L7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a scanning signal </text><reference><text>tuning circuits with automatic scanning over a band of frequencies <class-ref scheme="cpc">H03J7/18</class-ref></text></reference></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="H03L7/14" definition-exists="true" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for assuring constant frequency when supply or correction voltages fail </text><CPC-specific-text><text>or are interrupted</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="H03L7/141" definition-exists="false" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the phase-locked loop controlling several oscillators in turn</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="H03L7/143" definition-exists="false" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by switching the reference signal of the phase-locked loop</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="H03L7/145" definition-exists="false" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the switched reference signal being derived from the controlled oscillator output signal</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="H03L7/146" definition-exists="false" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using digital means for generating the oscillator control signal </text><reference><text><class-ref scheme="cpc">H03L7/141</class-ref>, <class-ref scheme="cpc">H03L7/143</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="12" additional-only="false" sort-key="H03L7/148" definition-exists="false" ipc-concordant="H03L7/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/148</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>said digital means comprising a counter or a divider</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="9" additional-only="false" sort-key="H03L7/16" definition-exists="false" ipc-concordant="H03L7/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H03L7/18" definition-exists="false" ipc-concordant="H03L7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a frequency divider or counter in the loop </text><reference><text><class-ref scheme="cpc">H03L7/20</class-ref>, <class-ref scheme="cpc">H03L7/22</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="H03L7/1803" definition-exists="false" ipc-concordant="H03L7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1803</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the counter or frequency divider being connected to a cycle or pulse swallowing circuit</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="H03L7/1806" definition-exists="false" ipc-concordant="H03L7/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1806</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the frequency divider comprising a phase accumulator generating the frequency divided signal</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="H03L7/181" definition-exists="false" ipc-concordant="H03L7/181" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/181</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>a numerical count result being used for locking the loop, the counter counting during fixed time intervals </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03L7/1806</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="H03L7/183" definition-exists="false" ipc-concordant="H03L7/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/183</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03L7/1806</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/185" definition-exists="true" ipc-concordant="H03L7/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03L7/185</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>using a mixer in the loop </text><reference><text><class-ref scheme="cpc">H03L7/187</class-ref> - <class-ref scheme="cpc">H03L7/195</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/187" definition-exists="true" ipc-concordant="H03L7/187" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03L7/187</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>using means for coarse tuning the voltage controlled oscillator of the loop </text><reference><text><class-ref scheme="cpc">H03L7/191</class-ref> - <class-ref scheme="cpc">H03L7/195</class-ref> take precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H03L7/189" definition-exists="false" ipc-concordant="H03L7/189" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/189</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>comprising a D/A converter for generating a coarse tuning voltage</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/191" definition-exists="true" ipc-concordant="H03L7/191" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/191</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using at least two different signals from the frequency divider or the counter for determining the time difference </text><reference><text><class-ref scheme="cpc">H03L7/193</class-ref>, <class-ref scheme="cpc">H03L7/195</class-ref> take precedence</text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/193" definition-exists="true" ipc-concordant="H03L7/193" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03L7/193</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider </text><reference><text>pulse counters/frequency dividers <class-ref scheme="cpc">H03K21/00</class-ref> - <class-ref scheme="cpc">H03K29/00</class-ref></text></reference></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="H03L7/195" definition-exists="false" ipc-concordant="H03L7/195" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H03L7/195</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>in which the counter of the loop counts between two different non zero numbers, e.g. for generating an offset frequency </text><reference><text><class-ref scheme="cpc">H03L7/193</class-ref> takes precedence; pulse counters for predetermined counting <class-ref scheme="cpc">H03K21/00</class-ref> - <class-ref scheme="cpc">H03K29/00</class-ref></text></reference></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="H03L7/197" definition-exists="false" ipc-concordant="H03L7/197" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/197</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H03L7/1806</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/1972" definition-exists="false" ipc-concordant="H03L7/197" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1972</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for reducing the locking time interval </text><reference><text><class-ref scheme="cpc">H03L7/1974</class-ref>, <class-ref scheme="cpc">H03L7/199</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="12" additional-only="false" sort-key="H03L7/1974" definition-exists="false" ipc-concordant="H03L7/197" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1974</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for fractional frequency division</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="H03L7/1976" definition-exists="true" ipc-concordant="H03L7/197" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1976</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a phase accumulator for controlling the counter or frequency divider</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H03L7/1978" definition-exists="false" ipc-concordant="H03L7/197" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/1978</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a cycle or pulse removing circuit</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="12" additional-only="false" sort-key="H03L7/199" definition-exists="false" ipc-concordant="H03L7/199" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/199</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with reset of the frequency divider or the counter, e.g. for assuring initial synchronisation</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="H03L7/20" definition-exists="false" ipc-concordant="H03L7/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it </text><reference><text><class-ref scheme="cpc">H03L7/22</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="H03L7/22" definition-exists="true" ipc-concordant="H03L7/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using more than one loop</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H03L7/23" definition-exists="false" ipc-concordant="H03L7/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/23</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with pulse counters or frequency dividers</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H03L7/235" definition-exists="false" ipc-concordant="H03L7/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nested phase locked loops</text></CPC-specific-text></title-part></class-title></classification-item></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="H03L7/24" definition-exists="true" ipc-concordant="H03L7/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using a reference signal directly applied to the generator</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="H03L7/26" definition-exists="true" ipc-concordant="H03L7/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L7/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using energy levels of molecules, atoms, or subatomic particles as a frequency reference</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="H03L9/00" definition-exists="false" ipc-concordant="H03L9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L9/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Automatic control not provided for in other groups of this subclass</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H03L207/00" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H03L207/00" 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>H03L2207/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indexing scheme relating to automatic control of frequency or phase and to synchronisation</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H03L207/04" 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>H03L2207/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications for maintaining constant the phase-locked loop damping factor when other loop parameters change</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="H03L207/05" 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>H03L2207/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Compensating for non-linear characteristics of the controlled oscillator</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="H03L207/06" 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>H03L2207/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Phase locked loops with a controlled oscillator having at least two frequency control terminals</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="H03L207/08" 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>H03L2207/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifications of the phase-locked loop for ensuring constant frequency when the power supply fails or is interrupted, e.g. for saving power</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="H03L207/10" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indirect frequency synthesis using a frequency multiplier in the phase-locked loop or in the reference signal path</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="H03L207/12" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Indirect frequency synthesis using a mixer in the phase-locked loop</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="H03L207/14" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Preventing false-lock or pseudo-lock of the PLL</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="H03L207/18" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Temporarily disabling, deactivating or stopping the frequency counter or divider</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="H03L207/50" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H03L2207/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>All digital phase-locked loop</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme> |