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AC timing asymmetry reduction circuit including summing DC offset voltage with timing signal

  • US 5,469,305 A
  • Filed: 12/17/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 12/17/1993
  • Status: Expired due to Term
First Claim
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1. In a data recovery system which reads data from a magnetic medium and which derives timing information from a comparator, a method to compensate for AC timing asymmetry comprising:

  • detecting data transitions in the form of timing signals;

    iteratively accumulating an approximate DC offset voltage based on timing asymmetry in the timing signal, the approximate DC offset voltage of successive iterations converging on an accurate offset voltage;

    dividing the approximate DC offset voltage;

    controlling the DC offset voltage division by predetermined switching of the approximate DC offset voltage between an active and an inactive state; and

    summing the divided DC offset voltage and the timing signal.

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