Resolving meta-stability in a clock and data recovery circuit
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United States of America Patent
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Jan 30, 2018
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app pub date -
Nov 8, 2016
filing date -
Nov 8, 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 phase and a crossing phase, respectively, of a sampling clock supplied by a phase interpolator in the receiver; generating a phase detect result signal in response to phase detection of the data samples and the crossing samples; filtering the phase detect result signal to generate a phase interpolator code, the phase interpolator generating the sampling clock based on the phase interpolator code; determining an average phase detect result from the phase detect result signal; and adjusting the phase interpolator code in response to the average phase detect result being less than a threshold value.
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