Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 41, Issue 4, Pages 851-858Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2006.870753
Keywords
CMOS image sensor; dynamic range; linearity; sensitivity
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In a CMOS image sensor featuring a lateral overflow integration capacitor in a pixel, which integrates the overflowed charges from a fully depleted photodiode during the same exposure, the sensitivity in nonsaturated signal and the linearity in saturated overflow signal have been improved by introducing a new pixel circuit and its operation. The floating diffusion capacitance of the CMOS image sensor is as small as that of a four transistors type CMOS image sensor because the lateral overflow integration capacitor is located next to the reset switch. A 1/3-inch NIGA format (640(H) x 480(V) pixels), 7.5 x 7.5 mu m(2) pixel color CMOS image sensor fabricated through 0.35-mu m two-poly three-metal CMOS process results in a 100 dB dynamic range characteristic, with improved sensitivity and linearity.
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