Power supply noise insensitive charge pump, loop filter, VCO...

Details Power supply noise insensitive charge pump, loop filter, VCO... Power supply noise insensitive charge pump, loop filter, VCO...

2006-02-23

2009-06-02

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S057000, C331S034000, C327S157000

Reexamination Certificate

active

07541881

ABSTRACT:
An oscillating circuit includes a charge pump, a loop filter and a voltage controlled oscillator. The charge pump and the loop filter generates a differential voltage signal. The loop filter is responsive to the differential voltage signal and generates a filtered differential voltage control signal that is proportional to the differential voltage signal. The voltage controlled oscillator is responsive to the filtered differential voltage control signal and generates a periodic signal that has a frequency that corresponds to the filtered differential voltage control signal.

REFERENCES:
patent: 5559476 (1996-09-01), Zhang et al.
patent: 5781048 (1998-07-01), Nakao et al.
patent: 6469585 (2002-10-01), Dai et al.
patent: 7167056 (2007-01-01), Fang et al.
patent: 2003/0206042 (2003-11-01), Walker et al.

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