Linear two-terminal integrated circuit photo sensor

Details Linear two-terminal integrated circuit photo sensor Linear two-terminal integrated circuit photo sensor

1982-02-01

1984-11-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, 330288, 330308, H01J 4014

Patent

active

044853017

ABSTRACT:
An integrated circuit includes a principal photo diode connected to the input of a multistage current mirror amplifier. Darlington cascode circuits are integrated into the output branches of the amplifying stages to obviate nonlinear sensitivity of those stages due to Early effect. Each of the cascode circuits have their input base tied to the top end of a diode string through which a current proportional to the photo current is flowing. Thus, there is no DC component in the two supply terminals; in a dark ambient, no supply/signal current flows; and in a light ambient, the supply/signal current is directly proportional to the light intensity.

REFERENCES:
patent: 4118621 (1978-10-01), Monticelli et al.
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.

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