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Oscillator tuning method

  • US 6,670,852 B1
  • Filed: 10/17/2001
  • Issued: 12/30/2003
  • Est. Priority Date: 10/17/2001
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first circuit configured to generate an output signal oscillating at a first frequency in response to a first control signal; and

    a second circuit configured to (a) receive a calibration signal oscillating at a second frequency and (b) generate said first control signal in response to (i) a counter value when in a first mode and (ii) a stored value when in a second mode, wherein, while in said first mode, said counter value is adjusted in response to a difference between said first frequency and said second frequency.

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