Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Engineering Company, Limited

Fumihiro Watanabe

Hiroshi Murakami

Hideo Hara

Fumihide Murao

Tatsuya Hohmoto

Hideho Itoh

A current-voltage conversion circuit which is capable of performing logarithmic compression is obtained using only CMOS processes. An emitter of a PNP transistor (10) and a current input terminal (51) are connected commonly to a reverse input terminal of an operational amplifier (53), while a first reference voltage input terminal is connected to a non-reverse input terminal of the operational amplifier (53). A collector of the PNP transistor (10) is grounded and a base of the PNP transistor (10) is connected to an output terminal of the operational amplifier (53) and an output terminal (55). A current (I) is supplied to the current input terminal (51) while a first reference voltage (V.sub.REF1) is applied to the first reference voltage input terminal. The PNP transistor (10) is formed by CMOS processes. The current-voltage conversion circuit is manufactured in a shorter manufacturing time and at a reduced cost.

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Hyogo, Japan

Fumihiro Watanabe