Active pixel sensor cell that reduces the effect of 1/f noise, i

Details Active pixel sensor cell that reduces the effect of 1/f noise, i Active pixel sensor cell that reduces the effect of 1/f noise, i

1996-03-01

1998-02-24

Ngo, Ngan V.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

257290, 257291, 257292, 257461, 257465, H01L 31062, H01L 31113

Patent

active

057214255

ABSTRACT:
The accuracy of an active pixel sensor cell is increased by utilizing a reset diode in lieu of the reset transistor that is conventionally used to reset the voltage on the photodiode of the cell. The reset diode, which is largely unaffected by 1/f noise, consistently resets the photodiode to a substantially constant voltage as opposed to the reset transistor which varies the reset voltage on the photodiode across integration periods due to the effect of 1/f noise. In the present invention, the photodiode is formed by forming a well region of a second conductivity type in a substrate of a first conductivity type. The reset diode is then formed by forming a reset region of the first conductivity type in the well region.

REFERENCES:
patent: 5191398 (1993-03-01), Mutoh
patent: 5289023 (1994-02-01), Mead
patent: 5408113 (1995-04-01), Kanno et al.
patent: 5625210 (1997-04-01), Lee et al.
Fossum, E., Active-pixel sensors challenge CCSs, Technology Guide: Detector Handbook, Laser Focus World, Jun. 1993, pp. 83-87, Pasadena, CA.
Mendis, S. et al., Progress in CMOS Active Pixel Image Sensors, SPIE vol. 2172, (1994) Center for Space Microelectronics Tech., Jet Propulsion Laboratory, California Institute of Technology, pp. 19-29, paper presented at a Conference on Feb. 7-8, 1994 in San Jose, CA.
Kawashima, H. et al., A 1/4 Inch Format 250K Pixel Amplified MOS Image Sensor Using CMOS Process, 1993 IEEE, pp. 575-578, Tokyo, Japan, no month.
Dickinson, A. et al., A 256 .times.256 CMOS Active Pixel Image Sensor with Motion Detection, ISSCC95/Session 13/Image Sensors and Systems/Paper TP 13.5, 1995 IEEE International Solid-State Circuits Conf., Feb. 16, 1995, Pasadena, CA.

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