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Calibration techniques for frequency synthesizers

  • US 7,546,097 B2
  • Filed: 03/06/2002
  • Issued: 06/09/2009
  • Est. Priority Date: 03/06/2002
  • Status: Expired due to Term
First Claim
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1. A method of calibrating an oscillator comprising:

  • using a frequency divider to divide the frequency of an oscillator signal to generate a first signal;

    using a frequency divider to divide the frequency of a reference signal to generate a second signal;

    wherein generating the first signal and generating the second signal comprise synchronizing the phases of the first and second signals during calibration; and

    adjusting the frequency of the oscillator based on a comparison of the first and second signals, the adjusting comprising decreasing the oscillator frequency when the first signal edge arrives before the second signal edge, and increasing the oscillator frequency when the first signal edge arrives after the second signal edge.

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