Phase locked loop

Details Phase locked loop Phase locked loop

2009-05-08

2011-11-22

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S010000, C331S016000, C331S017000, C331S034000

Reexamination Certificate

active

08063707

ABSTRACT:
Phase locked loop circuits capable of increasing an equivalent capacitance thereof to improve stability are provided, in which an integral part comprises a first phase frequency detector providing a phase error signal, a first charge pump circuit generating a control signal according to the phase error signal, a controllable oscillator providing an output clock according to the control signal, and a sampling adjustment unit decreasing the number of times the control signal is updated according to the phase error signal. A proportional part is coupled between the controllable oscillator and a reference clock and operated in a fraction mode.

REFERENCES:
patent: 5739709 (1998-04-01), Banno
patent: 6614316 (2003-09-01), Masenas et al.
patent: 6788154 (2004-09-01), Maneatis
patent: 7095287 (2006-08-01), Maxim et al.
patent: 2003/0128074 (2003-07-01), Maxim et al.
patent: 2005/0111605 (2005-05-01), Loke et al.

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