Compensating digital counter for quartz crystal oscillator

Details Compensating digital counter for quartz crystal oscillator Compensating digital counter for quartz crystal oscillator

1976-10-28

1978-06-06

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

58 23R, 328 49, 328 63, 307269, 331 51, H03K 2100

Patent

active

040938735

ABSTRACT:
A programmable CMOS integrated circuit counter which compensates for fast or slow quartz crystal oscillators, particularly suited for watches. The circuit includes fuses which are programmed for a particular crystal; the programming is a function of the frequency deviation of the crystal oscillator from the standard frequency for that crystal oscillator. In the described watch circuit which employs a nominal 32,768hz crystal, compensation within .+-. 1ppm is obtained.

REFERENCES:
patent: 3777471 (1973-12-01), Koehler et al.
patent: 3958187 (1976-05-01), Suzuki et al.
patent: 4009445 (1977-02-01), Hasegawa
patent: 4015208 (1977-03-01), Hammer et al.
patent: 4020626 (1977-05-01), Kawabara et al.

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