Phase-locked loop apparatus using an embedded oscillator as a lo

Details Phase-locked loop apparatus using an embedded oscillator as a lo Phase-locked loop apparatus using an embedded oscillator as a lo

1987-04-23

1988-02-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331DIG2, 331 25, 331141, H03L 712

Patent

active

047244020

ABSTRACT:
An embedded circuit is placed in a phase-locked loop having the normal phase detector and voltage-controlled oscillator. The embedded circuit is transparent to phase-locked conditions of the loop and becomes operative in an oscillatory mode only when the loop loses its lock. An oscillatory detector is used to detect the oscillatory condition of the embedded circuit and causes the application of a sweep signal to the voltage-controlled oscillator to reestablish phase-locked conditions in the overall phase-locked apparatus.

REFERENCES:
patent: 4009448 (1977-02-01), Hopwood et al.
patent: 4246546 (1981-01-01), McDonald
patent: 4535459 (1985-08-01), Hogge, Jr.

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