Method and apparatus for assisting a phase lock loop in obtainin

Details Method and apparatus for assisting a phase lock loop in obtainin Method and apparatus for assisting a phase lock loop in obtainin

1987-10-07

1988-07-12

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331 8, 331 17, 331 25, 331DIG2, 375120, H03L 712

Patent

active

047572795

ABSTRACT:
The method consists in using a sawtooth signal at the output from a lowpass filter of a phase lock loop, in multiplying it by a low frequency squarewave signal, in integrating the resulting multiplied signal in order to obtain a sweep signal, and in controlling a voltage controlled oscillator of the phase lock loop by means of the sweep signal. The apparatus comprises a multiplier (7) and a low frequency generator (8). It may also include, prior to the multiplier, a hysteresis comparator (5) and a highpass filter (6). The output (S7) of the multiplier (7) is connected to a loop filter (3) in said phase lock loop in order to integrate the multiplied signal.

REFERENCES:
patent: 4015083 (1977-03-01), Bellisio
patent: 4246546 (1981-01-01), McDonald
patent: 4423390 (1983-12-01), Waters

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