Photo-electric circuit employing current mirrors

Details Photo-electric circuit employing current mirrors Photo-electric circuit employing current mirrors

1982-01-13

1984-06-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330288, H01J 4014, H03F 360

Patent

active

044544162

ABSTRACT:
A current mirror amplifier including three or more tandem stages has a photo diode connected, as usual, with one end at the input of the first stage, but with the other end at the input of a third or later stage, which third or later stage is made up of transistors of the same polarity type (NPN) as make up the first stage. Consequently a very low reverse bias is advantageously applied to the photo diode and the linearity and stability of the resulting photo electric device is enhanced with respect to changing input light levels and with respect to variations in DC supply voltage.

REFERENCES:
patent: 3424908 (1969-01-01), Sitter
patent: 4085411 (1978-04-01), Genesi
patent: 4118621 (1970-10-01), Monticelli et al.
patent: 4199753 (1980-04-01), Gontowski, Jr.
patent: 4216379 (1980-08-01), Genesi
Dennis M. 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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