PLL circuit with VCO gain control

Details PLL circuit with VCO gain control PLL circuit with VCO gain control

2010-03-31

2011-10-18

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S034000, C327S156000

Reexamination Certificate

active

08040191

ABSTRACT:
A PLL circuit includes first and second charge pump circuits controlling an output voltage according to an output signal of a phase comparator, a first filter filtering out predetermined frequency component included in a signal generated according to current output from the first charge pump circuit, and outputting the signal as a first voltage signal, a second filter inputting a current output from the second charge pump circuit and outputting a predetermined constant voltage as a second voltage signal, a voltage control unit outputting a third voltage signal according to a comparison result between the first voltage signal output from the first filter and a reference voltage signal, and a voltage controlled oscillator that has a first low gain property, a second low gain property, and a high gain property, and is controlled by the first to third voltage signals to generate an oscillating frequency.

REFERENCES:
patent: 6680632 (2004-01-01), Meyers et al.
patent: 7009456 (2006-03-01), Jasa et al.
patent: 7777577 (2010-08-01), Jennings et al.
patent: 2008/0042759 (2008-02-01), Watanabe
patent: 2008-48320 (2008-02-01), None

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