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DIGITAL PHASE DETECTOR

  • US 3,825,737 A
  • Filed: 12/11/1972
  • Issued: 07/23/1974
  • Est. Priority Date: 12/21/1971
  • Status: Expired due to Term
First Claim
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1. A digital phase detector comprising:

  • means responsive to an applied sinusoid S R Sin theta for forming a quadrature signal S R Cos theta ;

    means for periodically sampling and for digitally sign and magnitude encoding the samples;

    means responsive to the encoded magnitudes S and S for forming the difference signal L 1n S - 1n S ;

    means for forming a signal Alpha representative of an acute reference angle on a unit circle according to the relation Alpha tan 1 eL ; and

    means for adjusting the phase angle theta as a function of the match or mismatch of the signs of S and S defining the quadrant on a unit circle and the value of Alpha .

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