Automatic synchronization of an internal oscillator to an...

Details Automatic synchronization of an internal oscillator to an... Automatic synchronization of an internal oscillator to an...

2008-06-19

2011-12-06

Payne, David C. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S354000, C375S371000

Reexamination Certificate

active

08073092

ABSTRACT:
An internal integrated circuit clock oscillator is automatically synchronized to an external frequency reference by counting the number of periods of the internal clock oscillator (hereinafter “count”) that occur within a period of a lower frequency external frequency reference then comparing the count to the reference count. When the reference count is greater than the count, the frequency of the internal clock oscillator is increased. When the reference count is less than the count, the frequency of the internal clock oscillator is decreased. When the reference count and the count are substantially the same, the frequency of the internal clock oscillator is not changed.

REFERENCES:
patent: 5592129 (1997-01-01), Fried et al.
patent: 6181209 (2001-01-01), Tsai
patent: 6265916 (2001-07-01), Ono et al.
patent: 6329860 (2001-12-01), Komatsu
patent: 2004/0008060 (2004-01-01), Watanabe
patent: 0 841 754 (1998-05-01), None
PCT International Search Report, PCT/US2009/047339, 14 pages, Oct. 16, 2009.

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