超高增益低噪声红外焦平面读出电路研究  

Study on High-gain and Low Noise Infrared Focal Plane Readout Circuit

作　　者：景松 杨波[2] 黄张成[2] 龚海梅[2] 高海军 JING Song;YANG Bo;HUANG Zhangcheng;GONG Haimei;GAO Haijun(Hangzhou Dianzi University Graduate School,Hangzhou 310000,China;Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]杭州电子科技大学研究生院,浙江杭州310000 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《红外技术》2019年第12期1117-1123,共7页Infrared Technology

基　　金：浙江省自然科学基金重点项目（LZ17F010001）“面向生物细胞检测的CMOS毫米波电阻抗传感芯片的研究”

摘　　要：高增益探测对InGaAs焦平面探测器在微光夜视条件下成像有重要意义。设计了一款InGaAs焦平面用的高增益低噪声64×64元读出电路。读出电路输入级采用CTIA模式(电容负反馈放大),通过计算发现输入级运算放大器热噪声是主要噪声源,采用单端替代差分运放将输入级噪声降低26%。同时,研究积分电容和增益、满阱容量、噪声的关系,将积分电容降低到1 fF,实现了超高增益和低噪声探测。读出电路采用0.18mm工艺设计,像元中心距为30mm。经过PEX(寄生参数提取)参数提取,实际积分电容为0.94 fF,经过测试芯片整体功耗低至24.1 m W,电路噪声电子数为4.37e。High-gain detection of InGaAs focal plane arrays is important to low light night vision imaging. A high-gain low-noise 64′64 readout circuit has been developed for In GaAs focal plane arrays. CTIA(capacitance trans-impedance amplifier) was chosen as the input stage circuit. The thermal noise of the input stage integral operational amplifier was found to be the dominant source of noise through calculation. By using a single-ended alternative differential operational amplifier, input stage circuit noise could be reduced by 26%. Based on the research of relationship between integration capacitor and full-well capacity, gain and noise, ultra-high gain and low-noise results were achieved by reducing the integration capacitance to 1 fF. The readout circuit has been designed using 0.18 mm process and the pixel pitch was 30 mm. The overall power consumption was 24.1 m W. The circuit noise was 4.37 e when the actual integrated capacitor is 0.94 fF.

关 键 词：红外焦平面读出电路 高灵敏度 低噪声 MOM电容 积分运放 

分 类 号：TN402[电子电信—微电子学与固体电子学]