Adaptive oscillator apparatus for use in a phase-lock loop

Details Adaptive oscillator apparatus for use in a phase-lock loop Adaptive oscillator apparatus for use in a phase-lock loop

1987-04-23

1988-02-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 25, 331141, 331179, 331DIG2, H03B 520, H03L 712

Patent

active

047244011

ABSTRACT:
A phase-lock loop system incorporates a normally "transparent" oscillator used in detecting whether or not the system is in a locked condition. It is essential that the oscillator, a portion of which is serially involved in the phase-lock loop, have a long time constant, so as to minimally affect the closed loop's transfer function during phase-locked conditions. It is desirable, however, that when the phase-lock loop loses lock that the time constants of the transparent oscillator change to much smaller values for quick response of the oscillator and operation at a high frequency for detection purposes and quick extinction when phase-lock is acquired. The detection of oscillation of the transparent oscillator initiates the application of a low speed sweep signal being applied to the voltage controlled oscillator portion of the phase-lock loop to reestablish phase-locked conditions and eventually return of the transparent oscillator to its long time constant values.

REFERENCES:
patent: 4009448 (1977-02-01), Hopwood et al.
patent: 4077015 (1978-02-01), Carson et al.
patent: 4206420 (1980-06-01), Querry et al.
patent: 4523157 (1985-06-01), Sato

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