Alternate clock apparatus and methods for improving radio...

Details Alternate clock apparatus and methods for improving radio... Alternate clock apparatus and methods for improving radio...

2009-04-13

2011-11-29

Johnson, Ryan (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S045000, C331S057000, C331S17700V, C327S156000

Reexamination Certificate

active

08067989

ABSTRACT:
An alternate clock apparatus and method configured to reduce noise in selected frequency bands in an electronic device such as a communication device is described. In one embodiment the alternate clock includes a ring oscillator to generate multiple time shifted signals which may then be combined to generate clock signals at alternate frequencies to a primary reference. A resynchronization circuit may be coupled to the ring oscillator to periodically resynchronize the ring oscillator to a reference signal to reduce alternate clock jitter.

REFERENCES:
patent: 5889436 (1999-03-01), Yeung et al.
patent: 6337601 (2002-01-01), Klemmer
patent: 6788154 (2004-09-01), Maneatis
patent: 7741889 (2010-06-01), Chou
patent: 2006/0255867 (2006-11-01), May

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