半导体探测器输出电流检测系统前置放大器设计  

Design of Preamplifier for Output Current Measurement System of Semiconductor Detector

作　　者：郭子成 刘国福[1] 吴石林[1] 李懋 GUO Zi-cheng;LIU Guo-fu;WU Shi-lin;LI Mao(Department of Instrument Science and Technology, National University of Defense Technology, Changsha, 410073, China)

机构地区：[1]国防科学技术大学仪器科学与技术系,长沙410073

出　　处：《核电子学与探测技术》2017年第7期667-672,共6页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(11375264)资助

摘　　要：为满足半导体探测器输出电流检测系统的需求,设计了与之相适应的前置放大器。该前置放大器基于超低偏置电流运放ADA4530,采用单个反馈电阻和T型反馈网络的I/V变换前置放大电路组成。测试结果表明:该前置放大器的放大倍数可达10 mV/pA,直流偏移为8μV;对于pA级分辨率,其输出噪声电压频谱密度仅为17.75 nV/(Hz)^(1/2),输出总噪声为409μV;可用于μA^pA范围内的核辐射探测器电流信号测量。In order to meet the needs of the semiconductor detector output current measurement system, designed with the corresponding preamplifier. The preamplifier is based on the ultra-low bias current op amp ADA4530, using a single feedback resistor and a T-feedback network of I/V conversion preamplifier circuits. The results show that the preamplifier has a gain of 10 mV / pA and a DC offset of 8 μV. For the pA resolution, the output noise voltage density is only 17.75 nV/（Hz）^1/2, and the total noise is 409 μV. It can be used for the range of μA- pA current signal measurement of nuclear radiation detector.

关 键 词：半导体探测器 极微弱电流 I/V变换器 TINA-TI T型反馈网络 

分 类 号：TL821[核科学技术—核技术及应用]