A current mode CMOS active pixel sensor (APS) providing 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 presented. The pixel was implemented in a both a 3.3 V 0.35 µm and a 1.8 V 0.18 µm CMOS process. The 0.35 µm process pixel had an uncorrected FPN of 1.4%/0.7% with/without column readout mismatch. The 0.18 µm process pixel had 0.4% FPN after delta-reset sampling (DRS). The pixel size in both processes was 10 X 10 µm2, with fill factors of 26% and 66%, respectively.
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机译：提出了一种电流模式CMOS有源像素传感器（APS），可提供线性的光电流转换，固有的固定图案噪声（FPN）低。该像素具有在线性工作区域中使用pMOS读出晶体管输出可调增益电流的功能。本文讨论了像素的设计和操作，并对像素的时间噪声和FPN进行了分析。给出了零像素和一阶像素不匹配的结果。该像素采用3.3 V 0.35 µm和1.8 V 0.18 µm CMOS工艺实现。 0.35 µm工艺像素的未校正FPN为1.4％/ 0.7％（有/没有列读出不匹配）。经过增量重置采样（DRS）后，0.18 µm工艺像素的FPN为0.4％。在这两个过程中，像素大小均为10 X 10 µm2，填充因子分别为26％和66％。
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