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Implementing dynamic phase error correction method and circuit for phase locked loop (PLL)

  • US 9,264,052 B1
  • Filed: 01/20/2015
  • Issued: 02/16/2016
  • Est. Priority Date: 01/20/2015
  • Status: Active Grant
First Claim
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1. A method for implementing dynamic phase error correction for a phase locked loop (PLL) comprising:

  • providing a phase error correction circuit including an adjustable delay line placed in one of a reference clock path or a feedback clock path;

    said phase error correction circuit,detecting a propagation delay of a reference clock path from input pin to a phase frequency detector in the PLL;

    detecting a propagation delay of a feedback clock path from input pin to a phase frequency detector in the PLL;

    comparing the detected propagation delays and generating a control signal proportional to a mismatch;

    applying the generated control signal to the adjustable delay line, and continually adjusting a delay of the adjustable delay line until the reference and feedback paths are balanced.

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