Method and apparatus to provide digitally controlled crystal...

Details Method and apparatus to provide digitally controlled crystal... Method and apparatus to provide digitally controlled crystal...

2006-08-07

2010-10-05

Kinkead, Arnold (Department: 2817)

Oscillators

Plural oscillators

C331S047000, C331S048000, C331S055000, C331S057000

Reexamination Certificate

active

07808327

ABSTRACT:
Methods and systems to provide digitally controlled crystal oscillators are disclosed. One example method includes determining a state of an oscillator system and selecting a first output of a digitally controlled crystal oscillator or a second output of a second oscillator based on the determination. In an example implementation, the second oscillator is a ring oscillator.

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Colpitts oscillator, http://en.wikipedia.org/wiki/Colpitts—oscillator, downloaded on May 2, 2006, 4 pages.
CommsDesign Turning to Digital Crystal in GMS Transreceivers, James Kimery, Silicon Laboratories; Sep. 26, 2002, URL: http://www.commsdesign.com/showArticle.jthml?articleID=16505594, 5 pages.
U.S. Appl. No. 10/966,220 entitled Methods and Apparatus to Control Frequency Offsets in Digitally Controlled Crystal Oscillators, filed on Oct. 14, 2004.

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