Device and method for correcting the reset noise and/or the...

Details Device and method for correcting the reset noise and/or the... Device and method for correcting the reset noise and/or the...

2007-03-13

2007-03-13

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S241000

Reexamination Certificate

active

11127766

ABSTRACT:
A device for correcting the reset noise and/or the fixed pattern noise of an active pixel comprising a photosensitive element, the device comprising a transmission circuit connecting the photosensitive element to a correction node and operating with a first or a second transmission gain; a circuit for providing a correction voltage equal to the sum of a constant voltage and of the noise multiplied by an amplification gain equal to the inverse of the difference between the first and second transmission gains; and a correction circuit capable of bringing the correction node from the constant voltage to the correction voltage, the transmission circuit having the first transmission gain, and of bringing the correction node to the constant voltage, the transmission circuit having the second transmission gain.

REFERENCES:
patent: 6532040 (2003-03-01), Kozlowski et al.
patent: 6587142 (2003-07-01), Kozlowski et al.
Pain, B., et al., “Analysis and Enhancement of Low-light-level Performance of Photodiode-Type CMOS Active Pixel Imagers Operated with Sub-threshold Reset,” inProceedings of the IEEE Workshop on CCDs and AIS, Nagano, Japan, Jun. 1999, pp. 140-142.
Fowler, G., et al., “Low Noise Readout using Active Reset for CMOS APS,” inProceedings of SPIE, vol. 3965, pp. 126-135, 2000.

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