Ambient light rejecting quad photodiode sensor

Details Ambient light rejecting quad photodiode sensor Ambient light rejecting quad photodiode sensor

1989-09-01

1991-01-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, H01J 4014

Patent

active

049820818

ABSTRACT:
An ambient light rejecting quad photodiode sensor having compensation diodes connected with reverse polarity to respective quadrant photodiodes within the sensor, the compensation diodes being located outside of the area of illumination. By direct connection of compensation diodes in reverse polarity to each quadrant of the quad photodiodes, a large boost in signal to noise ratio is achieved for eliminating the effects of ambient room light as well as sensor dark current.

REFERENCES:
patent: 3962722 (1976-06-01), Ciciora
patent: 4441120 (1984-04-01), Gerritsen
patent: 4602272 (1986-07-01), Duschl
patent: 4630121 (1986-12-01), Suzuki
patent: 4642529 (1987-02-01), Penn
patent: 4659930 (1987-04-01), Johnson
patent: 4683467 (1987-07-01), Macaulay et al.
patent: 4800278 (1989-01-01), Taniguti
patent: 4879470 (1989-11-01), Sugawa

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