System and method to reduce glitch disturbance for...

Details System and method to reduce glitch disturbance for... System and method to reduce glitch disturbance for...

2007-02-13

2007-02-13

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S034000, C331S025000

Reexamination Certificate

active

10742805

ABSTRACT:
The invention system adjusts a phase/frequency detecting device in a phase locked loop. The phase/frequency detecting device compares a target clock signal generated from the phase locked loop with a predetermined reference clock signal, and outputs a set of control signals to further control the target clock signal to synchronize with the reference clock signal. A reset module counts the set of control signals and outputs a set of reset signals when a predetermined reset condition is met. A switch module counts the set of reset signals and switches the phase/frequency detecting device between a normal mode and a glitch protection mode when a predetermined switch condition is met. When the phase/frequency detecting device is under the glitch protection mode, and the predetermined reset condition set by the reset module is met, the reset module outputs the set of reset signals and resets the phase/frequency detecting device.

REFERENCES:
patent: 5128632 (1992-07-01), Erhart et al.
patent: 5334952 (1994-08-01), Maddy et al.
patent: 5818304 (1998-10-01), Hogeboom
patent: 5896066 (1999-04-01), Katayama et al.
patent: 6310521 (2001-10-01), Dalmia

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