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Timing recovery and frequency tracking system and method

  • US 20020039395A1
  • Filed: 04/30/2001
  • Published: 04/04/2002
  • Est. Priority Date: 04/28/2000
  • Status: Active Grant
First Claim
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1. A system for recovering timing information from a serial data signal, comprising:

  • a phase interpolator adapted to derive a sampling signal having an interpolated phase in response to a plurality of control signals; and

    a controller including a data path adapted to sample the serial data signal according to the sampling signal, a phase detector adapted to detect a phase offset between the sampling signal and the serial data signal, a phase error processor coupled to the phase detector and adapted to estimate a frequency offset between the sampling signal and the serial data signal based on the phase offset, a command generator coupled to the phase error processor and adapted to generate a rotator control signal in response to the frequency offset estimate, and a control signal rotator adapted to manipulate the control signals in response to the rotator control signal, whereby the controller causes the phase interpolator to rotate the interpolated phase of the sampling signal at a rate corresponding to the frequency offset.

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