Phase locked loop made operative when stable input sync signal i

Details Phase locked loop made operative when stable input sync signal i Phase locked loop made operative when stable input sync signal i

1992-10-06

1994-01-25

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, 331 20, 331 25, 358158, H03L 7085, H03L 718, H04N 504

Patent

active

052819264

ABSTRACT:
An oscillator control system includes a phase-locked loop having a programmable frequency divider operative within the loop. A switch is further included within the phase-locked loop to permit the loop to be open or closed in response to an input signal. A counter accumulates oscillator clock signal counts between each successive rising edge portion of the applied sync signal. A pair of shift registers sequentially store successive clock signal counts for the current and previous sync signal intervals. The output counts are compared for consistency by producing a difference signal therebetween which is utilized to control the phase-locked loop switch and close it once the consistency of sync signal has been established. The output counts of the shift registers are combined and used to provide a scaling factor which sets the frequency division of the programmable frequency divider within the phase-locked loop and properly scales the oscillator frequency to the sync signal frequency.

REFERENCES:
patent: 5019907 (1991-05-01), Murakoshi et al.
patent: 5038116 (1991-08-01), Motte

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