簡素で効果的な固定パターンノイズ抑圧を実現したCMOSイメージセンサの動作解析

概要

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A 1/3-inch 640 × 480-pixel CMOS image sensor was developed using a simple fixed-pattern-noise-reduction technology with a five-transistor pixel circuit and a low input-voltage I-V converter. In this report, we show the effectiveness of a low input-voltage I-V converter with a current-mirror circuit in improving the amplification ratio and linearity of a pixel circuit. The dependence of the pixel signal characteristics on the parameters of the pixel transistors was also analyzed. In a five-transistor pixel circuit, the threshold voltage of the X-Y addressing transistor affects the amplitude and level of the readout pulse. This report also contains analysis of the mechanism of the X-Y addressing transistor, illustrating the concept behind the selection of the threshold voltage.
2002-04-01