二极管型非制冷红外探测器的前端电路设计  

Design of front-end circuit for uncooled diode infrared detector

作　　者：赵国芬[1] 赵毅强[1] 赵公元 张志恒 郭肇敏 

机构地区：[1]天津大学电子信息工程学院专用集成电路设计中心,天津300072 [2]航天海鹰光电信息技术有限公司,天津300192

出　　处：《红外与激光工程》2016年第1期149-154,共6页Infrared and Laser Engineering

基　　金：国家863计划(2015AA042605)

摘　　要：设计了一种二极管型非制冷红外探测器的前端电路,该电路采用Gm-C-OP积分放大器的结构,将探测器输出的微弱电压信号经跨导放大器（OTA）转化为电流信号,再经电容反馈跨阻放大器（CTIA）积分转化为电压信号输出。该OTA采用电流反馈型结构,可以获得比传统OTA更高的线性度和跨导值。输入采用差分结构,可以有效地消除环境温度及制造工艺对探测器输出信号的影响。电路采用0.35μm CMOS工艺进行设计并流片,5 V电源电压供电。Gm-C-OP积分放大器总面积0.012 6 mm2,当输入差分电压为0~5 m V时,测试结果表明：OTA跨导值与仿真结果保持一致,Gm-C-OP积分放大器可实现对动态输入差分信号到输出电压的线性转化,线性度达97%,输出范围大于2V。A front-end circuit for uncooled diode infrared detector, composed of Gm-C-OP integrated amplifier, was designed. The small input voltage steered from diode detector was transferred into current by an operational transconductance amplifier （OTA）, and then the current was converted to voltage by a capacitor transimpedance amplifier （CTIA）. The OTA used a current feedback loop to achieve higher linearity and transconductance than the traditional one. By adopting differential input structure, Gm-C-OP integrated amplifier can eliminate the effect of ambient temperature and process on the output signal of detectors. The circuit was fabricated in a 0.35 μm CMOS process under 5 V supply voltage. The Gm-C- OP integrated amplifier occupies an area of 0.012 6 mm2. The input differential voltage varied from 0 to 5 mV. Testing results show that the transconductance of OTA is in accordance with the simulation results. The Gm-C-OP integrated amplifier can convert the dynamic small input voltage into a proper voltage linearly and the linearity is 97%. The output range exceeds 2 V.

关 键 词：跨导放大器 电容反馈跨阻放大器 Gm-C-OP积分放大器 

分 类 号：TN215[电子电信—物理电子学]