VOLTAGE-CONTROLLED OSCILLATOR AND PHASE-LOCKED LOOP
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United States of America
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Issued Date -
Mar 20, 2025
app pub date -
Sep 3, 2024
filing date -
Sep 3, 2024
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Abstract
A voltage-controlled oscillator includes an input circuit, a first current supply circuit, a second current supply circuit, a filtering circuit, and an oscillating circuit. The input circuit includes an operational amplifier and a first input transistor. The operational amplifier generates an output voltage according to an input voltage and a feedback voltage. The first input transistor generates an input current according to the output voltage and a power supply voltage. The first current supply circuit generates a first output current according to the input current. The second current supply circuit generates a second output current according to the input current. The filtering circuit couples to the input circuit and the second current supply circuit, and decrease an influence caused by a variation of the input current on the second current supply circuit. The oscillating circuit generates an output clock according to the first output current and the second output current.
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