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Sampler offset calibration during operation

  • US 10,574,487 B1
  • Filed: 04/08/2019
  • Issued: 02/25/2020
  • Est. Priority Date: 04/08/2019
  • Status: Active Grant
First Claim
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1. A method comprising:

  • sampling a data signal using a data sampler operating in a data signal processing path having a decision threshold associated with a decision feedback equalization (DFE) correction factor;

    measuring an eye opening of the data signal by adjusting a decision threshold of a spare sampler operating outside of the data signal processing path to determine a center-of-eye value for the decision threshold of the spare sampler;

    initializing the decision threshold of the spare sampler based on the center-of-eye value and the DFE correction factor;

    generating respective sets of phase-error signals for the spare sampler and the data sampler responsive to a detection of a predetermined data pattern; and

    updating the decision threshold of the data sampler based on an accumulation of differences in phase-error signals of the respective sets of phase-error signals.

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