Low pass filters in DLL circuits

Details Low pass filters in DLL circuits Low pass filters in DLL circuits

2005-07-12

2005-07-12

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000

Reexamination Certificate

active

06917230

ABSTRACT:
Circuits and methods are provided that reduce, if not prevent, the adverse effects of transient noise on phase adjustments made by digital delay lock loop (DLL) circuits, which typically generate a periodic output signal having a particular phase relationship with a periodic input signal. A digital low pass filter of a DLL circuit includes circuitry, such as, for example, a thermometer register, coupled to receive the outputs of a DLL phase detector. The low pass filter prevents the DLL circuit from making frequent changes to the phase of the DLL output signal.

REFERENCES:
patent: 5748125 (1998-05-01), Cederbaum et al.
patent: 6005425 (1999-12-01), Cho
patent: 6069506 (2000-05-01), Miller, Jr. et al.
patent: 6388480 (2002-05-01), Stubbs et al.
patent: 6438721 (2002-08-01), Wente

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