Rapid start oscillator latch

Details Rapid start oscillator latch Rapid start oscillator latch

1979-09-07

1982-05-04

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With pulse transforming means

368156, 368204, 331116R, G04C 1900, G04F 500, G04B 200

Patent

active

043285716

ABSTRACT:
A rapid start oscillator latch circuit for avoiding long start up time while maintaining minimum operating power for a crystal oscillator in an electronic watch. The oscillator is operated at a relatively high gain immediately after power is applied and until the oscillator is running, after which the oscillator is caused to operate under the normally preferred conditions. A power up pulse sets a latch and the latch is reset by either a pulse from the prescaler or a manual input. When the latch is set, the oscillator circuit is modified for quick start-up. After the oscillator is running, it activates the prescaler, and after several cycles of clock inputs to the prescaler, an output from the prescaler or a manual input resets the latch and the oscillator is returned to its normal operating condition.

REFERENCES:
patent: 3375466 (1968-03-01), Pratt
patent: 4039973 (1977-08-01), Yamashiro
patent: 4069659 (1978-01-01), Harris et al.
patent: 4103187 (1978-07-01), Imamura

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