Phase lock loop prepositioning apparatus with feedback control

Details Phase lock loop prepositioning apparatus with feedback control Phase lock loop prepositioning apparatus with feedback control

1983-12-29

1985-12-31

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, H03L 700

Patent

active

045624100

ABSTRACT:
A feedback-controlled current pump is coupled to the loop filter capacitor of a phase lock loop to provide a coarse prepositioning voltage and thereby accelerate the lockup process on a new frequency. Two voltage comparators monitor the capacitor voltage with respect to a selectable "window" centered about the desired voltage, and when the capacitor has been charged or discharged to a voltage within the window, the current pump providing the charging or discharging current to the capacitor is shut off.

REFERENCES:
patent: 3694776 (1972-09-01), Linder
patent: 3714463 (1973-01-01), Laune
patent: 4105948 (1978-08-01), Wolkstein
patent: 4138650 (1979-02-01), Anderson
patent: 4156855 (1979-05-01), Crowley
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4280104 (1981-07-01), Rzeszewski
patent: 4320530 (1982-03-01), Ikeda
patent: 4410860 (1983-10-01), Kipp et al.

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