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Modulation noise estimation mechanism

  • US 20040146098A1
  • Filed: 01/16/2004
  • Published: 07/29/2004
  • Est. Priority Date: 01/17/2003
  • Status: Active Grant
First Claim
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1. A method of estimating modulation noise for use in a transmitter having a phase locked loop, said method comprising the steps of:

  • calculating an average of historical samples of phase error samples produced by said phase locked loop;

    subtracting said average from a current phase error sample to yield a normalized phase error;

    generating an exception event if said normalized phase error exceeds a threshold; and

    repeating said steps of calculating, subtracting and generating over a period of time and outputting a failure indication if the number of exception events exceeds a maximum criteria and a pass indication otherwise.

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