Circuit to eliminate the dark current of a photodetector

Details Circuit to eliminate the dark current of a photodetector Circuit to eliminate the dark current of a photodetector

1995-07-10

1997-08-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 348243, 327514, H01J 4014

Patent

active

056568061

ABSTRACT:
Disclosed is a photodetector comprising at least one photosensitive diode and at least one read circuit enabling the charges generated by photoelectric effect in said diode to be converted into a voltage information element sampled by a switch, wherein said photosensitive diode has a first terminal connected to the gate and to the drain of a first transistor and a second terminal connected to the source of said first transistor and to the ground of said photodetector, wherein a second transistor with dimensions proportional to those of said first transistor is mounted as a current mirror with respect to said first transistor and wherein an integration capacitor is connected to the drain of said second transistor so as to collect said voltage information element at its terminals.

REFERENCES:
patent: 4839735 (1989-06-01), Kyomasu et al.
patent: 4857725 (1989-08-01), Goodnough et al.
patent: 4945418 (1990-07-01), Muton
patent: 5057682 (1991-10-01), Michon et al.
patent: 5343034 (1994-08-01), Sato

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