Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1988-09-09
1989-08-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
330257, H01J 4014
Patent
active
048535303
ABSTRACT:
A photosensitive semiconductor apparatus in which a photodiode is connected between the inverting input (-) and non-inverting input (+) terminals of an operational amplifier. A non-linear element is connected between the inverting input and output terminals of the amplifier. The amplifier includes a device for applying a reverse voltage across the photodiode. The reverse biasing voltage applying device may include a resistor connected in the circuit including one of the differential active loads of the amplifier, or different areas of the emitters of the differential active loads of the amplifer.
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Canon Kabushiki Kaisha
Nelms David C.
Oen William L.
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