Low-offset subsampling phase detector and method thereof
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United States of America Patent
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Oct 22, 2024
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app pub date -
Jun 13, 2023
filing date -
Jun 13, 2023
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Abstract
A method of phase detection includes receiving a reference clock and an input clock having a first input signal and a second input; sampling the first input signal and the second input signal into a first sample and a second sample; converting the first sample and the second sample into a first current and a second current; using a regulated current mirror to convert the first current into the third current; using a first current steering network to steer the second current into either a fourth current or a fifth current in accordance with a pulse signal; using a second current steering network to steer the third current into either a sixth current or a seventh current; connecting a lowpass filter to the output node to establish an output voltage and a lowpass-filtered voltage; and forcing the standby voltage to be equal to the lowpass-filtered voltage using a unity-gain buffer.
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