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Variable gain amplifier and sampler offset calibration without clock recovery

  • US 10,608,849 B1
  • Filed: 04/08/2019
  • Issued: 03/31/2020
  • Est. Priority Date: 04/08/2019
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating a time-varying information signal at an output of a variable gain amplifier (VGA);

    sampling, using a sampler having a vertical decision threshold associated with a target signal amplitude, the time-varying information signal asynchronously to generate a sequence of decisions from varying sampling instants in sequential signaling intervals, the sequence of decisions comprising (i) positive decisions indicating the time-varying information signal is above the target signal amplitude and (ii) negative decisions indicating the time-varying information signal is below the target signal amplitude;

    accumulating a ratio of positive decisions to negative decisions; and

    generating a gain feedback control signal to adjust a gain setting of the VGA responsive to a mismatch of the accumulated ratio with respect to a target ratio.

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