Low voltage bias circuit for a photo-diode

Details Low voltage bias circuit for a photo-diode Low voltage bias circuit for a photo-diode

1978-10-26

1980-08-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

354 51, H01J 3912

Patent

active

042163790

ABSTRACT:
A low-voltage bias circuit for a photo-diode includes first and second bipolar transistors with a common base connection and grounded emitters, the photo-diode being connected between the emitter of the first transistor and ground in the reverse polarity direction. A current-mirror circuit uses as the reference current the collector current from the first transistor, which is essentially the photo-current, and produces a feed-back current through the base-emitter junction of the second transistor to hold the voltage across the photo-diode at a near zero value for a wide range in values of photo-current. Thus there is minimum delay in the response of the photo-current to step-functions of the incident light.

REFERENCES:
patent: 3424908 (1969-01-01), Sitter
patent: 3486821 (1969-12-01), Westhaver
patent: 3808463 (1974-04-01), Yata et al.
patent: 4085411 (1978-04-01), Genesi

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