Digitally-synthesized loop filter method and circuit particularly useful for a phase locked loop

  • US 7,613,267 B2
  • Filed: 07/20/2004
  • Issued: 11/03/2009
  • Est. Priority Date: 07/10/2000
  • Status: Active Grant
First Claim
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1. A method for controlling an oscillator in a phase locked loop system, said method comprising:

  • generating a digital representation of a phase error signal of the phase locked loop system;

    generating a multi-bit accumulated digital phase error signal representing an accumulated value of successive values of the digital phase error signal; and

    generating an oscillator control signal corresponding to the accumulated digital phase error signal,wherein the digital phase error signal comprises a quantized-time and quantized-value signal which encodes polarity of phase error.

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