微电流信号的高带宽调理技术及应用

发布时间：2018-11-19 07:15

【摘要】：为实现对电流型快响应探测器微弱信号的高速探测和处理,给出了一种微电流信号的高带宽调理方法.分析了几种PIN光电探测器输出信号的频带和幅度特征;以脉宽50ns、电流范围20n A~0.1m A的微电流信号为设计目标,给出了微电流信号的调理方法和设计分析,设计并实现了针对该目标信号的高带宽调理电路;进行了性能对比测试实验,通过与光电倍增管PMT9215B进行输出响应对比,结果表明该调理电路对脉宽40ns的脉冲信号响应良好,响应波形的上升沿和半高宽约10ns,调理电路的信号带宽约35MHz,信号调理的带宽和幅度达到了量化采样要求,验证了该方法的正确性和可行性;应用该调理电路进行了4×32 PIN二维阵列光电探测系统的设计实现,系统动态范围约56d B,时间响应特性良好.
[Abstract]:In order to realize the high speed detection and processing of the weak signal of the current mode fast response detector, a high bandwidth adjustment method of the micro current signal is presented. The frequency band and amplitude characteristics of the output signals of several PIN photodetectors are analyzed. Taking the micro-current signal with a pulse width of 50ns and a current range of 20nAm ~ (-1) A as the design target, the conditioning method and design analysis of the micro-current signal are given, and the high-bandwidth regulating circuit for the target signal is designed and realized. By comparing the output response with photomultiplier tube (PMT9215B), the results show that the modulation circuit has a good response to the pulse signal of pulse width 40ns, and the rising edge and half maximum width of the response waveform are about 10ns. The signal bandwidth of the conditioning circuit is about 35 MHz, and the bandwidth and amplitude of the signal conditioning meet the requirement of quantization sampling, which verifies the correctness and feasibility of the method. The design and implementation of 4 脳 32 PIN 2-D array photoelectric detection system with this conditioning circuit is carried out. The dynamic range of the system is about 56 dB, and the time response characteristic is good.
【作者单位】：西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室;
【基金】：国家863项目(2015AA8041070G) 国家自然科学基金(No,11475138) 国家重点实验室基金(No.SKLIPR1304)
【分类号】：TN15

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