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Automatic internal trimming calibration method to compensate process variation

  • US 8,386,829 B2
  • Filed: 06/17/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 06/17/2009
  • Status: Active Grant
First Claim
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1. A method of trimming timing in an integrated circuit, comprising:

  • applying an external reference signal to the integrated circuit;

    comparing the reference signal to an internal signal generated from within the integrated circuit, whereby a sequence of results of the comparing is stored by associating a first value with a plurality of pulses of the internal signal having a failing edge that occurs before a falling edge of a pulse of the reference signal and by associating a second value with a plurality of pulses of the internal signal having a falling edge that occurs after a falling edge of a pulse of the reference signal; and

    performing automatic trimming to adjust the internal signal according to a result of the comparing.

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