Phase lock loop frequency synthesizer

Details Phase lock loop frequency synthesizer Phase lock loop frequency synthesizer

1993-11-02

1995-10-24

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 25, 331 17, 327105, 327107, 327156, 327157, 327159, H03L 7187

Patent

active

054613442

ABSTRACT:
A phase lock loop frequency synthesizer is applied to radio communication devices or the like, in order to reduce frequency error at a time of frequency changing, and considerably reduce a frequency changing time. At the time of frequency changing, a first loop filter performs frequency coarse adjustment, and charges or discharges a capacitor in a second loop filter to voltage corresponding to target frequency. Further, a controller feeds a voltage controlled oscillator with a frequency fine control data so as to output the target frequency, and controls a loop filter in a phase lock loop to be switched over from the first loop filter to the second loop filter.

REFERENCES:
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5036295 (1991-07-01), Kamitani
patent: 5107220 (1992-04-01), Andoh
patent: 5170130 (1992-12-01), Ichihara
patent: 5258724 (1993-11-01), Tanis et al.

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