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PHASE FREQUENCY DETECTOR

  • US 20140077841A1
  • Filed: 09/14/2012
  • Published: 03/20/2014
  • Est. Priority Date: 09/14/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first phase frequency detector (PFD) to determine a coarse phase difference between a first clock signal and a second clock signal, the first PFD to generate a first output indicating the coarse phase difference; and

    a second PFD, coupled to the first PFD, to determine a fine phase difference between the first clock signal and the second clock signal, the second PFD to generate a second output indicating the fine phase difference.

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