Method for operating an active pixel sensor cell that reduces no

Details Method for operating an active pixel sensor cell that reduces no Method for operating an active pixel sensor cell that reduces no

1996-09-10

1999-12-14

Garber, Wendy

Television

Camera, system and detail

Combined image signal generator and general image signal...

348308, 348310, 348312, 257292, 2502081, H04N 5217, H04N 5335

Patent

active

060024321

ABSTRACT:
The noise in the photo information extracted from an active pixel sensor cell is reduced by resetting the voltage on the photodiode of the cell to the power supply voltage, and by reading the cell immediately before and after the cell is reset. The voltage on the photodiode is reset to the power supply voltage by applying a reset voltage to the gate of the reset transistor conventionally used to reset the photodiode where the reset voltage is sufficiently larger than the power supply voltage to cause the voltage on the photodiode to be pulled up to the power supply voltage.

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Dickinson, A. et al., "TP 13.5: A 256.times.256 CMOS Active Pixel Image Sensor with Motion Detection ," 1995 IEEE/International Solid-State Circuits Conference, pp. 226-227.
Agwani, S. et al., "A High Speed, Dual Output Channel, Stage Selectable, TDI CCD Image Sensor for High Resolution Applications ," pp. 124-133, SPIE, vol. 2415, Sep. 1995.
Delbruck, T. et al., "Analog VLSI Phototransduction by continuous-time, adaptive, logarithmic photoreceptor circuits, " pp. 1-24, Calif. Inst. of Tech. Computation & Neural Systems Program, CNS Memo No. 30, May 11, 1994.
Delbruck, T., "Imager Circuits, " Synaptics/National Imager Project, Test Imager Circuit Documentation, pp. 1-8, Aug. 23, 1995.
IMEC VZW, "Fuga data sheet ", p. 26, Leuven, Belgium, Aug. 30, 1995.

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