Photodetector and solid-state imaging apparatus

Details Photodetector and solid-state imaging apparatus Photodetector and solid-state imaging apparatus

1997-08-18

1999-06-15

Westin, Edward P.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250214R, H01L 3100

Patent

active

059124636

ABSTRACT:
A light chopper periodically transmits and blocks light, and first a dark current cancelling circuit determines an approximate mean value of the dark current from a photodiode when the light is blocked and cancels thus the mean value from the current signal fed into the integrated circuit, add to this, a differential arithmetic circuit that subtracts the remaining dark current component from the output of the integration circuit, thus the remaining signal indicates only the signal current component.

REFERENCES:
patent: 3963942 (1976-06-01), Sequin et al.
patent: 4079238 (1978-03-01), Lampe et al.
patent: 4781195 (1988-11-01), Martin

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