新型电荷灵敏前置放大器研制

摘要

基于Multisim软件仿真,研制了一种新型电荷灵敏前置放大器,其输入缓冲器采用JFET构成的共源共栅电路,放大级电路采用集成运算放大器。经测试,信号上升时间为85ns；当RC成形时间为10μs时,零电容噪声为970e,噪声斜率为7.40 e/pF,对137 Cs源γ射线测量信噪比为32：1。%This article develops a new charge sensitive preamplifier based on Multisim. The input buffer of the preamplifier adopts cascode composed by JFET and the amplifier stage adopts integrated operational amplifier. The test results show that the signal rising time is 85ns,zero-capacitance noise is 970e and noise slope is 7. 40 e/pF when the CR shaping time is 10 μs,signal-noise ratio for the gamma-ray of 137 Cs source is 32:1.