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Self-tuning and temperature compensated voltage controlled oscillator

  • US 6,023,198 A
  • Filed: 06/08/1998
  • Issued: 02/08/2000
  • Est. Priority Date: 06/08/1998
  • Status: Expired due to Fees
First Claim
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1. A method of self-tuning a voltage controlled oscillator (VCO) circuit in a radio, comprising the steps of:

  • internally measuring the radio'"'"'s initial temperature;

    storing the radio'"'"'s initial temperature;

    initializing a programmable voltage;

    applying the programmable voltage to the VCO to tune the VCO;

    applying a control voltage to the VCO to lock the VCO;

    determining if the VCO is in a locked condition;

    measuring the control voltage internally to the radio if the VCO is in a locked condition;

    comparing the control voltage of the VCO in the locked condition to a predetermined control voltage range stored in the radio;

    automatically adjusting the programmable voltage if the VCO is in an unlocked condition or if the control voltage does not fall within the predetermined control voltage range;

    repeating the steps of determining, measuring, comparing, and automatically adjusting, until the VCO is locked and the control voltage falls within the predetermined control voltage range;

    monitoring the radio temperature when the VCO is locked and the control voltage falls within the predetermined control voltage range;

    calculating the difference between the radio'"'"'s initial temperature and the monitored temperature to determine whether a predetermined delta temperature threshold has been reached; and

    returning to the step of determining, if a predetermined temperature threshold has been reached.

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