Prepositioning circuit for phase lock loop

Details Prepositioning circuit for phase lock loop Prepositioning circuit for phase lock loop

1983-12-29

1985-12-31

LaRoche, Eugene

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, H03B 304

Patent

active

045624119

ABSTRACT:
Prepositioning of a phase lock loop by charging or discharging the loop filter capacitor to a voltage close to the desired VCO control voltage is accomplished rapidly by the addition of a current pump. The current pump, responsive to a tuning voltage corresponding to the VCO control voltage provides a pulse of high rate current to charge or discharge the capacitor. The current pulse, which is of sufficient length to ensure that the capacitor achieves the desired voltage, swamps out the contribution of the loop charge pump which is responsive to the loop phase detector. When disabled, the current pump appears as a virtual open circuit to the loop capacitor, so that no current leakage occurs through the current pump.

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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