Citizen Watch Company, Ltd.

Tsutomu Tanaka

Yasuhiko Nishikubo

Toyoharu Fujikawa

A temperature detector made by a CMOS integrated circuit. The temperature detector comprises a first constant voltage circuit for producing a first constant voltage, a second constant voltage circuit applied with the first constant voltage for producing a second constant voltage, and a ring oscillator applied with the second constant voltage for producing an output voltage dependent of ambient temperature. Each constant voltage circuit has a standard resistor in the form of a diffusion resistor, a current-mirror circuit as a standard voltage generating circuit, and a voltage follower, and the ring oscillator has a delay resistor formed by a MOS transistor.

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Tokorozawa, Japan

Tsutomu Tanaka