Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1997-12-29
1999-10-26
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214A, 2502141, 257461, H01J 4014
Patent
active
059733144
ABSTRACT:
A photo diode is connected to an input terminal of an amplifier to which a feedback resistor is connected. An output current of this photo diode flows from the output terminal side of the amplifier through the feedback resistor. The output of the photo diode converted into a voltage is given to the output terminal side of the amplifier. The feedback resistor is formed by a P-type resistor region provided in an N-type resistor land of a semiconductor substrate. In order to apply an inverse bias to the PN junction between the resistor land and resistor region, the resistor land is connected to the output terminal of the amplifier.
REFERENCES:
patent: 3872329 (1975-03-01), Dodson, III
patent: 4314152 (1982-02-01), Fenk
Pyo Kevin
Rohm & Co., Ltd.
Westin Edward P.
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