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Phase alignment circuitry and methods

  • US 7,295,641 B1
  • Filed: 11/26/2003
  • Issued: 11/13/2007
  • Est. Priority Date: 11/26/2003
  • Status: Expired due to Fees
First Claim
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1. A method of detecting phase of transitions in a data signal relative to a reference clock signal comprising:

  • producing a plurality of phase-shifted versions of the reference clock signal;

    using each of the plurality of phase-shifted versions of the reference clock signal in order of magnitude of phase shift to sample the data signal and thereby produce samples of the data signal;

    comparing the samples to a training pattern that is initially aligned with training data in the data signal;

    re-aligning the training pattern with the training data each time use of one of the plurality of phase-shifted versions of the reference clock signal causes the training pattern to become misaligned with the training data; and

    analyzing information including which of the plurality of phase-shifted versions of the reference clock signal caused misalignment to approximate the phase of the transitions.

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