Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-11-08
1997-07-29
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214C, 367901, H01J 4014
Patent
active
056524250
ABSTRACT:
It is an object of present invention to provide a low-cost photoelectric conversion module in which a signal for compensating noise caused by changes in temperature and variations in power supply is obtained. In the photoelectric conversion module according to the present invention, a first amplifier having an input terminal connected to the anode of a light-receiving element for converting an optical signal into an electrical signal amplifies the electrical signal to obtain an amplified signal. A second amplifier having an input terminal connected to one electrode of a capacitor outputs an amplified signal for compensating noise of the electrical signal amplified by the first amplifier. The other electrode of the capacitor is connected to the cathode of the light-receiving element. The capacitor has a capacitance value equal to the capacitance of the light-receiving element.
REFERENCES:
patent: 3655987 (1972-04-01), Hinds
patent: 4139767 (1979-02-01), Witkowicz
patent: 4902886 (1990-02-01), Smisko
patent: 4959535 (1990-09-01), Garrett
Sawada Sosaku
Sekiguchi Takeshi
Shiga Nobuo
Pyo Kevin
Sumitomo Electric Industries Ltd.
Westin Edward P.
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