JSSC 2007第11期Image Sensors0.35μm/0.18μm

Linear Current-Mode Active

提出一种线性光电流转换的CMOS有源像素传感器，具有低固定模式噪声。

3.3V 0.35μm CMOS, 1.8V 0.18μm CMOS, 10μm×10μm像素尺寸

CMOS有源像素传感器线性光电流转换固定模式噪声可调增益像素设计

▸创新点1：线性光电流转换（电路创新）。该像素传感器通过优化设计，实现了光强到输出电流的线性转换，显著提高了传感器的动态范围和精度，避免了传统非线性转换带来的失真问题。

▸创新点2：可调增益电流输出（电路创新）。采用pMOS晶体管在线性区工作，实现了输出电流增益的可调性，增强了传感器的灵活性和适应性，适用于不同光照条件下的应用场景。

▸创新点3：低固定模式噪声（系统创新）。通过优化像素设计和采用delta-reset采样技术，显著降低了固定模式噪声（FPN），在0.18μm工艺下FPN低至0.4%，提升了图像质量。

▸创新点4：双工艺兼容性（系统创新）。该设计在3.3V 0.35μm和1.8V 0.18μm两种CMOS工艺下均成功实现，展示了其工艺兼容性和广泛适用性，为不同应用需求提供了灵活性。

Abstract

A current mode CMOS active pixel sensor (APS) pro- viding linear light-to-current conversion with inherently low ﬁxed pattern noise (FPN) is presented. The pixel features adjustable- gain current output using a pMOS readout transistor in the linear region of operation. This paper discusses the pixel’s design and operation, and presents an analysis of the pixel’s temporal noise and FPN. Results for zero and ﬁrst-order pixel mismatch are pre- sented. The pixel was implemented in a both a 3.3 V 0.35 m and a 1.8 V 0.18 m CMOS process. The 0.35 m process pixel had an uncorrected FPN of 1.4%/0.7% with/without column readout mis- match. The 0.18 m process pixel had 0.4% FPN after delta-reset sampling (DRS). The pixel size in both processes was 10 10 m/50, with ﬁll factors of 26% and 66%, respectively.