基于奇偶行分时复用的CTIA读出电路  

A CTIA ROIC based on odd&even row time multiplexing

作　　者：王熙远 程禹 申人升[1] 常玉春[1] 汪家奇[1] 熊波涛 WANG Xi-yuan;CHENG Yu;SHEN Ren-sheng;CHANG Yu-chun;WANG Jia-qi;XIONG Bo-tao(School of Microelectronics,Dalian University of Technology,Dalian 116000,China)

机构地区：[1]大连理工大学微电子学院,辽宁大连116000

出　　处：《激光与红外》2024年第11期1714-1718,共5页Laser & Infrared

基　　金：2022年工业与信息化部产业基础再造和制造业高质量发展专项项目(No.TC220A04A-49);国家重点研发计划项目(No.2023YFB4503003)资助。

摘　　要：本文介绍了一种应用于短波红外焦平面阵列的高动态范围读出电路。输入级采用电容跨阻放大器结构。通过分时复用奇偶行中像素运放作为比较器,实现各像元的转换增益可单独切换并根据背景辐射自适应调整,像素中的积分电容、采保电路、源跟随器等模块由奇偶像素共用既节省面积又提高了像素设计的自由度。该结构在不增加像素面积情况下,增大了满阱容量,降低了等效噪声电荷,提高了动态范围。读出电路像素阵列大小为64×64,像素间距为30μm。仿真结果表明读出电路的噪声电荷为57.8e-,满阱容量为12.5Me-,动态范围为106dB,读出速率达10MHz。In this paper,a high dynamic range ROIC for short wavelength infrared focal plane arrays are presented.A capacitive transimpedance amplifier structure is used for the input stage.By time multiplexing the pixel op amps in the odd even rows as comparators,the conversion gain of each pixel can be individuallyswitched and adaptivelyadjusted according to the background radiation,and the modules such as integrating capacitors,sample and hold circuits,and source followers in the pixels are shared by the odd even pixels to save the area and improve the freedom of pixel design.This structure increases the full well capacity,reduces the equivalent noise charge number,and improves the dynamic range without increasing the pixel area.The pixel array size of the readout circuit is 64×64 with a pixel pitch of 30μm,and the simulation results show that the readout circuit has a noise charge of 57.8 e-,a full well capacity of 12.5 Me-,a dynamic range of 106 dB,and a readout rate up to 10 MHz.

关 键 词：电容跨阻放大器 读出电路 红外焦平面阵列 自选电容 分时复用 

分 类 号：TN47[电子电信—微电子学与固体电子学] TN216