Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1982-02-01
1984-08-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
307311, 330308, H01J 4014
Patent
active
044671911
ABSTRACT:
An integrated circuit photo sensor has a principal photo diode whose reverse voltage is maintained at a low and relatively invariant value by a circuit comprised of a biasing diode string in series with a small auxiliary photo diode and an emitter follower coupling the diode string bias voltage to the principal photo diode. This results in reliable starting without contributing a DC component of current in the power supply so this circuit is suitable for use in a linear two-terminal-type integrated-circuit photo sensor.
REFERENCES:
patent: 4085411 (1978-04-01), Genesi
patent: 4118621 (1978-10-01), Monticelli et al.
patent: 4199753 (1980-04-01), Gontowski, Jr.
Monticelli, "A Versatile Monolithic IC Building-Block for Light-Sensing Applications", IEEE Journal of Solid-State Circuits; vol. SC-13; No. 6; Dec. 1978; pp. 873-881.
Chalfin Edward
Gontowski, Jr. Walter S.
Nelms David C.
Sprague Electric Company
Westin Edward P.
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