Phased-locked oscillation circuit system with measure against sh

Details Phased-locked oscillation circuit system with measure against sh Phased-locked oscillation circuit system with measure against sh

1991-10-02

1992-11-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 25, 331 27, H03L 714, H03L 718

Patent

active

051646846

ABSTRACT:
A phase-locked oscillation circuit system for dividing a clock whose frequency is an integral multiple of a signal produced by dividing the frequency of an input clock. While the input clock to the circuit is shut off, a phase comparator included in the circuit is supplied with a reference signal which is the signal being applied to the compare input of the comparator and the timing of which is modified by a small amount. The system protects the output of a voltage controlled oscillator and, therefore, the output clock of a phase-locked oscillation circuit thereof against disturbances ascribable to the shut-off and recovery of an input clock.

REFERENCES:
patent: 3882412 (1975-05-01), Apple, Jr.
patent: 4135166 (1979-01-01), Marchetti
patent: 4633193 (1986-12-01), Scordo

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