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Phase locked loop having automatic-input tuning and phase control circuits

  • US 4,376,268 A
  • Filed: 10/23/1980
  • Issued: 03/08/1983
  • Est. Priority Date: 10/31/1979
  • Status: Expired due to Term
First Claim
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1. An automatic phase-controlled oscillator for producing an output clocking signal whose phase and frequency vary with those of an input information signal applied thereto, comprising;

  • information signal input means for receiving said information signal;

    control signal means for deriving a control signal representative of the frequency of said input information signal, but deriving said control signal independently from said information signal;

    variable-frequency tuning circuit means for receiving said control signal and coupled to said input means for tuning on the basis of said control signal to pass said input information signal as a tuned signal; and

    clocking signal generating circuit means for providing said output clocking signal in dependence upon the phase of said tuned signal.

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