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Compensation for crystal offset in PLL-based crystal oscillators

  • US 8,242,849 B1
  • Filed: 03/30/2011
  • Issued: 08/14/2012
  • Est. Priority Date: 03/30/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • storing in on-chip storage in an oscillator device a crystal offset value that is based on a ratio between a rated frequency of an output of a crystal oscillator and a measured frequency of the output of the crystal oscillator;

    storing a rated divide value corresponding to a selected frequency for an output of the oscillator device, the rated divide value corresponding to the rated frequency;

    adjusting the rated divide value by the crystal offset value and generating an adjusted divide value; and

    using the adjusted divide value to generate an output signal of the oscillator device with the selected frequency.

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