Minimum intrusion search oscillator for use in feedback loops

Details Minimum intrusion search oscillator for use in feedback loops Minimum intrusion search oscillator for use in feedback loops

1989-09-19

1991-09-17

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331 25, 331175, 331DIG2, H03L 700

Patent

active

050498380

ABSTRACT:
A search oscillator (12) is disclosed for use with a closed-loop system (10) to sense when the system is out of lock and enhance the system's pull-in capabilities. The oscillator includes a loop filter (22) and a sensing circuit (24), composed of a positive limit sensor (26) and negative limit sensor (28). When the system is out of lock, the output V.sub.out of the oscillator slews positive or negative in an effort to restore the system to lock. The positive and negative limit sensors monitor the output and reset it when predetermined thresholds are reached, allowing the search or sweep operation to continue until lock is achieved.

REFERENCES:
patent: 3231728 (1966-01-01), Kusto
patent: 3553566 (1968-03-01), Nagy, Jr.
patent: 3579150 (1971-05-01), Badessa
patent: 3648071 (1972-03-01), Mrazek
patent: 3743957 (1973-07-01), Feistel
patent: 3918005 (1975-11-01), Bruckenstein et al.
patent: 4510461 (1985-04-01), Dickes et al.
patent: 4617527 (1986-10-01), Naitoh

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