HgCdTe柔性中波红外探测器放大电路设计及噪声分析
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摘要
设计了一种应用于HgCdTe柔性中波红外探测器的微弱信号放大电路,该电路由电桥电路、调零电路及滤波电路组成。采用平衡电桥与仪表运算放大器INA333相结合的方式搭建电桥电路;并针对探测器直流分量过大问题,设计了可调零、带增益的信号处理电路;最后通过由二阶有源滤波器组成的滤波电路将高频噪声滤除。利用运算放大器的E_n-I_n噪声模型,对放大电路进行了噪声分析,并测试了探测器在弯曲状态下的响应性能。实验结果表明,所设计的放大电路增益为86 d B,噪声均方根值低于6.1 m V;柔性探测器的曲率半径为3 mm;当探测器光敏面上的光谱辐照功率为6.75×10~(-7)W时,产生的光电信号约102mV。
In this study, we design a weak signal amplifier circuit for an HgCdTe flexible medium wave infrared detector, comprising a bridge amplifier circuit, zeroing circuit, and filter circuit. The bridge amplifier circuit is implemented with a bridge circuit and an instrument operational amplifier(INA333). In allusion to the problem of excessive direct current component of the detector, we developed a signal processing circuit with zeroing ability and gain adjustment. Subsequently, high-frequency noise is eliminated by a filter circuit composed of a second-order active filter. The En-In noise model of operational amplifiers is used to analyze the noise of the amplifier circuit and verify the response performance of the detector under different bending states. The experimental results demonstrate that the gain of the amplifier circuit is 86 d B,and the noise is below 6.1 m V. The detector is stable upon bending to a curvature of 3 mm. When the spectral irradiation power on the photosensitive surface of the detector is 6.75×10~(-7)W, the resulting photoelectric signal is approximately 102 mV.
In this study, we design a weak signal amplifier circuit for an HgCdTe flexible medium wave infrared detector, comprising a bridge amplifier circuit, zeroing circuit, and filter circuit. The bridge amplifier circuit is implemented with a bridge circuit and an instrument operational amplifier(INA333). In allusion to the problem of excessive direct current component of the detector, we developed a signal processing circuit with zeroing ability and gain adjustment. Subsequently, high-frequency noise is eliminated by a filter circuit composed of a second-order active filter. The En-In noise model of operational amplifiers is used to analyze the noise of the amplifier circuit and verify the response performance of the detector under different bending states. The experimental results demonstrate that the gain of the amplifier circuit is 86 d B,and the noise is below 6.1 m V. The detector is stable upon bending to a curvature of 3 mm. When the spectral irradiation power on the photosensitive surface of the detector is 6.75×10~(-7)W, the resulting photoelectric signal is approximately 102 mV.
引文
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[3]Floreano D,Pericetcamara R,Stéphane Viollet,et al.Miniature curved artificial compound eyes[C]//Proc Natl Acad Sci U S A,2013,110(23):9267-9272.
[4]YUAN L,DAI J,FAN X,et al.Self-Cleaning Flexible Infrared Nanosensor Based on Carbon Nanoparticles[J].Acs Nano,2011,5(5):4007.
[5]LI L,GU L,LOU Z,et al.ZnO Quantum Dot Decorated Zn2SnO4Nanowire Heterojunction Photodetectors with Drastic Performance Enhancement and Flexible Ultraviolet Image Sensors[J].ACS Nano,2017,11(4):4067-4076.
[6]陈伯良,李向阳.航天红外成像探测器[M].北京:科学出版社,2016.CHEN Boliang,LI Xiangyang.Space infrared imaging detector[M].Beijing:Science press,2016.
[7]陈杜.空间目标红外辐射谱测量信息获取与处理系统研究[D].上海:中国科学院上海技术物理研究所,2006.CHEN Du.Research on information acquisition and processing system of infrared radiation spectrum measurement of space targets[D].Shanghai:Shanghai institute of technical physics,Chinese academy of sciences,2006.
[8]丁少华.空间目标信息获取与处理[D].北京:中国科学院研究生院中国科学院大学,2011.DING Shaohua.Acquisition and processing of space target information[D].Beijing:Graduate school of Chinese academy of sciences,university of Chinese academy of sciences,2011.
[9]占建明,汶德胜,王宏,等.基于光电二极管的前置放大电路噪声分析[J].半导体技术,2011,36(4):304-306.ZHAN Jianming,WEN Desheng,WANG Hong,et al.Noise analysis of preamplifier circuit based on photodiode[J].Semiconductor Technology,2011,36(4):304-306.
[10]朱惜辰,姚英.HgCdTe光导探测器的低频噪声[J].红外与毫米波学报,1989(5):375-380.ZHU Xichen,YAO Ying.Low-frequency noise of HgCdTe photoconductive detector[J].Journal of Infrared and Millimeter Wave,1989(5):375-380.
[11]高芬,安莹,董威.基于MATLAB的黑体辐射量计算[J].光学与光电技术,2005,3(5):30-32.GAO Fen,AN Ying,DONG Wei.Calculation of blackbody radiation based on MATLAB[J].Optics and Optoelectronics Technology,2005,3(5):30-32.
[12]徐国森,王继元.电功率脉冲对HgCdTe光导探测器的性能影响[C]//全国光电技术学术交流会暨全国红外科学技术交流会,2003.XU Guosen,WANG Jiyuan.Effect ofelectric power pulse on the performance of HgCdTe photoconductive detector[C]//national optoelectronic technology academic exchange meeting and national infrared science and technology exchangemeeting,2003.