Photoelectric transducer

Details Photoelectric transducer Photoelectric transducer

1998-05-28

2000-12-19

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502081, H01L 3102

Patent

active

061630241

ABSTRACT:
A photoelectric transducer having a CMOS constant-current-source circuit which can reduce fixed-pattern noise even if the CMOS constant-current-source circuit and photosensors are formed in the same semiconductor substrate is provided. The photoelectric transducer includes a constant-current-source circuit in which a current mirror circuit including pMOS transistors and a current mirror circuit including nMOS transistors are subjected to tandem connection between power supplies, and a plurality of photosensors formed by a second-conduction-type semiconductor formed near a surface of a first-conduction-type semiconductor substrate. The constant-current-source circuit and the plurality of photosensors are formed on the same semiconductor substrate. A voltage drop circuit is provided at one of tandem connection portions of the current mirror circuits in order to suppress stray carriers present near the plurality of photosensors.

REFERENCES:
patent: 5401952 (1995-03-01), Sugawa
patent: 5453629 (1995-09-01), Gofuku et al.
patent: 5481124 (1996-01-01), Kozuka et al.
patent: 5677201 (1997-10-01), Kozuka et al.
patent: 5861655 (1999-01-01), Kozuka et al.
patent: 5917960 (1999-06-01), Sugawa

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