Temporal change in data-crossing clock phase difference to resolve meta-stability in a clock and data recovery circuit
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United States of America Patent
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May 1, 2018
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app pub date -
Dec 15, 2016
filing date -
Dec 15, 2016
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Abstract
An example method of clock and data recovery in a receiver includes generating data samples and crossing samples of a received signal based on a data clock signal and a crossing clock signal, respectively, which are derived from a sampling clock signal; adjusting a phase of the sampling clock signal using a clock and data recovery (CDR) circuit based on the data samples and the crossing samples; adjusting relative phase between the data clock signal and the crossing clock signal from a first phase difference to a second phase difference that is less than ninety degrees; and reverting the relative phase between the data clock signal and the crossing clock signal to the first phase difference after a threshold time period.
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