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VCO controlled by separate phase locked loop

  • US 4,912,433 A
  • Filed: 05/16/1989
  • Issued: 03/27/1990
  • Est. Priority Date: 05/17/1988
  • Status: Expired due to Term
First Claim
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1. A voltage controlled oscillator circuit comprising:

  • a PLL section for supplying a deviation signal according to a received reference frequency signal and a received reference voltage; and

    a VCO section for supplying an oscillation output according to the deviation signal and a received control voltage;

    said PLL section comprising;

    first delay means for delaying the reference frequency signal according to first delay control signal and outputting a delay signal;

    phase difference detection means for comparing the phase of the reference frequency signal with that of the delay signal and outputting the deviation signal based on the phase difference; and

    first delay control means for outputting the first delay control signal having a signal level corresponding to the reference voltage and the deviation signal.

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