一种集成图像处理功能的数字像元焦平面读出电路  

A digital pixel focal plane readout circuit with integrated image processing function

作　　者：黄文刚[1,2] 陶治颖 彭超 周亮 黄晓宗 HUANG Wengang;TAO Zhiying;PENG Chao;ZHOU Liang;HUANG Xiaozong(Sichuan Institute of Solid-State Circuits,China Electronics Technology Group Corp,Chongqing 401332,China;School of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]中国电子科技集团公司第二十四研究所,重庆401332 [2]重庆大学光电工程学院,重庆400044

出　　处：《太赫兹科学与电子信息学报》2024年第10期1088-1093,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(62105240,62075159);国家重点研发计划资助项目(2019YFB22023002)。

摘　　要：设计了一种像元级数字化焦平面读出电路,克服了传统模拟读出电路技术的电荷容量局限,实现了更大的动态范围和更低噪声的数字化图像读出;同时在像元内部进行数字化图像处理,可实现非均匀校正(NUC)、盲元补偿、数字时间延迟积分(TDI)、空间滤波等图像预处理功能。该电路采用40 nm CMOS工艺流片,面阵规格为640×512,像元步进为30μm,全芯片尺寸约22 mm×19 mm。测试结果显示,该电路通过TDI、空间滤波功能可大幅降低(分别约90%和63%)输出图像空间噪声,提升成像质量。A pixel-level digital focal plane readout circuit was designed to overcome the charge capacity limitations of traditional analog readout circuit technology,enabling a larger dynamic range and lower noise digital image readout.Additionally,digital image processing is performed internally at the pixel level,enabling functions such as Non-Uniformity Correction(NUC),dead pixel compensation,digital Time-Delay Integration(TDI),and spatial filtering for image preprocessing.The circuit was fabricated using a 40 nm CMOS process with an array specification of 640×512,a pixel pitch of 30μm,and the overall chip size is approximately 22 mm×19 mm.Test results indicate that the circuit can significantly reduce(by approximately 90%and 63%,respectively)the spatial noise in the output image through TDI and spatial filtering functions,thereby enhancing the image quality.

关 键 词：读出电路 数字像元 非均匀校正 盲元补偿 

分 类 号：TN216[电子电信—物理电子学]