Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1988-10-31
1989-09-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250209, 250214C, H01J 4014
Patent
active
048641200
ABSTRACT:
A circuit comprising a semiconductor photodiode with a first and a second terminal and an internal series resistor, including an amplifier with a first input, a second input and an output, the first photodiode terminal being connected to the first amplifier input, the second photodiode terminal being connected to the second amplifier input and a negative feedback being inserted between the output of the amplifier and its first input, characterized in that a coupling is introduced between the output and the second input of the amplifier, by means of which a voltage is generated between the second input of the amplifier and the second terminal of the photodiode, this voltage being oppositely equal to the product of the internal series resistance and the signal current flowing through the resistor.
REFERENCES:
patent: 4730128 (1988-03-01), Seki
Enzlin Theodoor H.
Van Der Laak Henricus J. M.
Nelms David C.
Oen William L.
Rich Marianne R.
Tamoshunas Algy
U.S. Philips Corporation
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