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Circuitry for switching effective electrode area on a crystal in a crystal oscillator to vary the oscillation frequency

  • US 4,376,919 A
  • Filed: 09/17/1980
  • Issued: 03/15/1983
  • Est. Priority Date: 10/16/1979
  • Status: Expired due to Term
First Claim
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1. A circuit for switching the effective electrode area on a crystal resonator in a crystal oscillator to vary the oscillation frequency, comprising:

  • a crystal resonator suitable for use as a frequency standard;

    plural electrodes on the surface of said crystal resonator jointly defining an electrode area;

    pulse generator means for generating pulses having a variable duty factor; and

    switching circuit means responsive to the pulses for switching the effective electrode area on the crystal resonator for controlling the oscillation frequency of said crystal resonator.

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