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Radio frequency data communications device

  • US 6,316,975 B1
  • Filed: 09/28/1998
  • Issued: 11/13/2001
  • Est. Priority Date: 05/13/1996
  • Status: Expired due to Term
First Claim
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1. A method of determining when frequency lock occurs relative to a desired frequency, the method comprising:

  • providing a phase lock loop including a voltage controlled oscillator configured to oscillate at a frequency which varies responsive to a voltage applied to the voltage controlled oscillator;

    applying the voltage to the voltage controlled oscillator to produce a frequency of oscillation less than the desired frequency;

    increasing the voltage applied to the voltage controlled oscillator using one or more steps of a first size;

    increasing the voltage applied to the voltage controlled oscillator using one or more steps of a second size smaller than the first size;

    decreasing the voltage applied to the voltage controlled oscillator using one or more steps of a third size smaller than the second size;

    increasing the voltage applied to the voltage controlled oscillator using a step of the third size; and

    indicating that lock has occurred in response to the increase of the step of the third size.

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