Time-to-digital converter, frequency tracking apparatus and method
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United States of America Patent
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Aug 1, 2017
Grant Date -
Feb 9, 2017
app pub date -
Oct 21, 2016
filing date -
Apr 23, 2014
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Abstract
Embodiments of the present invention provide a time-to-digital converter, where the time-to-digital converter includes a delay unit, a first sampling unit, and a second sampling unit. The delay unit is connected to the first sampling unit and is configured to receive a first clock signal and delay the first clock signal; the first sampling unit is configured to perform sampling on the first clock signal and generate a first phase signal, so that a first phase-locked module adjusts a frequency of the first clock signal; the delay unit is further connected to the second sampling unit and is configured to receive a frequency-adjusted first clock signal and delay the frequency-adjusted first clock signal; and the second sampling unit is configured to perform sampling on the frequency-adjusted first clock signal and generate a second phase signal.
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