Phase locked loop circuit for video hard copy controller

Details Phase locked loop circuit for video hard copy controller Phase locked loop circuit for video hard copy controller

1977-10-17

1980-05-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 25, 358264, H03B 304

Patent

active

042030757

ABSTRACT:
A phase-locked loop circuit includes a voltage controlled oscillator responsive to a control voltage for generating a periodic first output signal comprised of pulses occurring at a first frequency determined by the value of said control voltage. In response to the first output signal, a periodic feedback signal is generated comprised of pulses occurring at a second frequency which bears a predetermined relationship toward the first frequency. In response to the feedback signal and to a first input signal having a first periodic interval during which pulses at a third frequency occur and a second periodic interval during which said pulses at the third frequency do not occur, a second output signal is generated comprised of the pulses of the first input signal during the first periodic interval of the input signal and the pulses of the feedback signal during the second periodic interval of the first input signal. Finally, in response to the feedback signal and the second output signal, a control voltage is generated having a value dependent upon the phase differential between the feedback signal and the second output signal.

REFERENCES:
patent: 3688210 (1972-08-01), Fort et al.

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