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Apparatus and methods for phase synchronization of phase-locked loops

  • US 9,979,408 B2
  • Filed: 05/05/2016
  • Issued: 05/22/2018
  • Est. Priority Date: 05/05/2016
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) communication system comprising:

  • a phase-locked loop (PLL) configured to generate one or more output clock signals;

    a sampling circuit configured to generate a plurality of samples by sampling the one or more output clock signals based on timing of a reference clock signal;

    a phase difference calculation circuit configured to generate a phase difference signal based on the plurality of samples and a tracking digital phase signal representing the phase of the PLL; and

    a phase adjustment control circuit configured to provide a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.

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