PHASE-LOCKED LOOP DEVICE AND OPERATION METHOD THEREOF
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United States of America Patent
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Issued Date -
Apr 11, 2024
app pub date -
May 3, 2023
filing date -
Oct 6, 2022
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Abstract
A phase-locked loop device and its operating method are provided. The phase-locked loop device includes a voltage controlled oscillator configured to generate an output clock signal, a divider configured to divide the output clock signal into first and second phase division signals having a constant phase difference, a sampling phase frequency detector configured to sample a sampling voltage based on the first phase division signal and output any one of the sampling voltage, a first supply voltage, and a second supply voltage based on the second phase division signal, a transconductance circuit configured to output a conversion current based on a hold voltage, and a loop filter configured to generate a voltage control signal based on the conversion current and output the voltage control signal to the voltage controlled oscillator.
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