Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1977-05-19
1978-10-03
Dahl, Lawrence J.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214C, 330 59, 330288, 330308, H01J 3912
Patent
active
041186214
ABSTRACT:
A circuit useful in replicating the current produced in a photo diode operated as a current source at zero bias. A second scaled area photo diode is used to bias the circuit to maintain the zero bias over a wide range of illumination levels. The circuit operates in the picoampere range and is linear over at least six orders of magnitude.
REFERENCES:
patent: 3424908 (1969-01-01), Sitter
patent: 3850809 (1974-11-01), Mannonen
Monticelli Dennis M.
Sleeth Robert S.
Dahl Lawrence J.
National Semiconductor Corporation
Woodward Gail W.
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