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DIGITAL PHASE LOCKED LOOP FOR LOW JITTER APPLICATIONS

  • US 20150288370A1
  • Filed: 04/04/2014
  • Published: 10/08/2015
  • Est. Priority Date: 04/04/2014
  • Status: Active Grant
First Claim
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1. A phase locked loop circuit, comprisinga ring oscillator;

  • a digital path including a digital phase detector;

    an analog path including a linear phase detector; and

    a feedback path connecting an output of the ring oscillator to the digital path and to the analog path,wherein;

    the digital path and the analog path are parallel paths;

    the digital path provides a digital tuning signal to the ring oscillator that digitally controls a frequency of the ring oscillator; and

    the analog path provides an analog tuning signal to the ring oscillator that continuously controls the frequency of the ring oscillator.

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