Electric power conversion systems – Current conversion – Constant current to constant voltage or vice versa
Patent
1995-05-02
1996-05-07
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Constant current to constant voltage or vice versa
323280, H02M 700, G05F 140
Patent
active
055152600
ABSTRACT:
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.
REFERENCES:
patent: 4618814 (1986-10-01), Kato et al.
patent: 5157352 (1992-10-01), Chickanosky, Jr. et al.
patent: 5225766 (1993-07-01), O'Neill
patent: 5324982 (1994-06-01), Nakazato et al.
patent: 5341087 (1994-08-01), Van Leeuwen
patent: 5381082 (1995-01-01), Schlicht
Hara Hideo
Hohmoto Tatsuya
Itoh Hideho
Murakami Hiroshi
Murao Fumihide
Mitsubishi Denki & Kabushiki Kaisha
Mitsubishi Electric Engineering Co. Ltd.
Nguyen Matthew V.
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