Phase locked loop providing three-level control signal to VCO

Details Phase locked loop providing three-level control signal to VCO Phase locked loop providing three-level control signal to VCO

1984-10-11

1986-12-02

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 14, 331 27, 331 17, H03L 708

Patent

active

046267972

ABSTRACT:
In the disclosed phase-locked loop circuit, a phase detecting circuit produces a control signal for controlling the frequency of an oscillator according to the phase difference between the output of the oscillator and an input signal. The control signal controls the oscillator only during a specific period of time in which there is a phase difference. This eliminates the need for a low pass loop filter and results in a quick response, stable phase-locked loop circuit.

REFERENCES:
patent: 3899746 (1975-08-01), Gammel
patent: 4123726 (1978-10-01), Schucht
patent: 4330759 (1982-05-01), Anderson
patent: 4513255 (1985-04-01), Terbrack
patent: 4520319 (1985-05-01), Baker

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