Electronic low power clock circuit and method

Details Electronic low power clock circuit and method Electronic low power clock circuit and method

1996-09-12

1998-06-16

Kinkead, Arnold

Oscillators

Plural oscillators

331 47, 331175, 331111, 331143, 327291, 395555, 368202, H03B 1900

Patent

active

057677476

ABSTRACT:
A relatively low frequency oscillator in junction with a much higher frequency oscillator is used to produce a clock that is both accurate and minimizes power consumption. The high frequency oscillator is enabled only during a small portion of the clock's operation and is used to gauge the output of the low frequency oscillator. The output of the high frequency oscillator is counted during its operation period, and the amount counted is accumulated for subsequent time periods. When the accumulated count reaches a predetermined value, a clock output is provided.

REFERENCES:
patent: 4110701 (1978-08-01), Medwin
patent: 4305041 (1981-12-01), Frerking
patent: 4513259 (1985-04-01), Frerking
patent: 5416435 (1995-05-01), Jokinen et al.
patent: 5673005 (1997-09-01), Pricer
Lanfranchi, D., et al., "A Microprocessor-Based Analog Wristwatch Chip with 3 Seconds/Year Accuracy", IEEE: International Solid State Circuits Conference Digest of Technical Papers, Feb. 1994, pp. 92-93.
Vittoz E., "Low-Power Design: Ways to Approach the Limits", IEEE: International Solid State Circuits Conference Digest of Technical Papers, Feb. 1994, pp. 14-18.

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