Phase locked loop and method for charging phase locked loop

Details Phase locked loop and method for charging phase locked loop Phase locked loop and method for charging phase locked loop

2011-08-02

2011-08-02

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07990192

ABSTRACT:
A phase locked loop (PLL) and a method for charging the PLL are disclosed. The charge circuit includes: a threshold judging module, adapted to output a signal to a receiving module, and when the voltage of a filter reaches a preset threshold, output a valid signal to the receiving module; the receiving module, adapted to receive a trigger signal and output a first control signal to a charging module, and when the signal from the threshold judging module is a valid signal, adapted to output a second control signal to the charging module; the charging module, adapted to charge the filter when receiving the first control signal and stop charging the filter when receiving the second control signal. So that a better voltage may be provided to the PLL to shorten the locking time of the PLL.

REFERENCES:
patent: 5874863 (1999-02-01), Wojewoda et al.
patent: 5942926 (1999-08-01), Yamaguchi
patent: 6914489 (2005-07-01), Charlon
patent: 7746132 (2010-06-01), Okamoto et al.
patent: 2003/0006848 (2003-01-01), Cordoba
patent: 1162219 (1997-10-01), None
1stOffice Action in corresponding Chinese Application No. 200910081492.0 (Feb. 1, 2011).

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