AFC circuit for producing a ripple-free oscillator control volta

Details AFC circuit for producing a ripple-free oscillator control volta AFC circuit for producing a ripple-free oscillator control volta

1989-03-29

1990-03-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 331 20, 331 27, 358158, 328134, 328155, H03L 708

Patent

active

049085824

ABSTRACT:
An AFC circuit using counters, flip-flops and logic gates produces a first pulse signal only when the phase of a VCO output signal lags the phase of a reference signal, and produces a second pulse signal only when the phase of the VCO output signal leads the phase of the reference signal. The first and second pulse signals control a switch to connect a first or a second constant current source to charge or discharge a filter circuit, to thereby produce a control voltage for the VCO. When the VCO output signal is in phase with the reference signal, the switch remains in a neutral position to hold a constant control voltage on the filter.

REFERENCES:
patent: 3824483 (1974-07-01), Margala et al.
patent: 4520394 (1985-05-01), Kaneko
patent: 4613827 (1986-09-01), Takamori et al.
Yuuichi Kawakami, "Phase Synchronous Oscillating Circuit", Patent Abstracts of Japan, Aug. 1981, vol. 5, No. 125 (Japanese Patent No. 56-61833, 5-27-81).

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