Watch circuit with oscillator gain control

Details Watch circuit with oscillator gain control Watch circuit with oscillator gain control

1980-12-24

1983-06-07

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

368159, H03B 536

Patent

active

043873502

ABSTRACT:
A watch circuit arrangement for conserving battery power includes a feedback connection between the crystal oscillator of the watch circuit and the display voltage generator which is responsive to the crystal oscillator output to develop sufficient output voltage for the watch display. Specifically, the output of the display voltage generator, which may be a voltage multiplier, is sensed by a display voltage sensing circuit which controls the gain of the crystal oscillator. Initially, when battery power is applied to the watch circuit, the voltage multiplier has zero output voltage, which conditions the crystal oscillator to have a sufficiently high gain to start the oscillator. After several cycles of oscillator signal, the voltage multiplier output increases, which conditions the crystal oscillator to have a lower gain for reducing power consumption while sustaining oscillation.

REFERENCES:
patent: 4039973 (1977-08-01), Yamashiro
patent: 4064468 (1977-12-01), Kumata
patent: 4282496 (1981-08-01), Heuner
patent: 4307354 (1981-12-01), Miyagawa et al.

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