针对紫外探测器输出信号微弱，常规放大电路难以实现对微弱信号放大，为此设计了一种适于近地层紫外动态目标探测的微弱信号放大器。通过分析探测器输出信号特点，提出了微弱信号放大器的指标要求。围绕预定的指标要求设计电荷前置放大电路、整形滤波电路以及增益调整电路，使放大器的输出波形满足总体设计要求。经软件 Multisim模拟仿真结果表明，该放大器各项指标均达到设计要求，可以将探测器输出电荷脉冲信号放大整形输出相应准高斯脉冲波形，为后续处理提供可靠的信号，具有一定适用性。

Aiming at that UV detector output signal is weak and the conventional amplifier circuit amplifying weak signals is difficult to realize, therefore a UV weak signal amplifier which is suitable for dynamic target detection near surface is designed in this paper. By analyzing the characteristics of the detector output signal, the index requirements of weak signal amplifier are proposed in this paper. Around predetermined targets, the charge pre-amplifier circuit, shaping filter circuit and gain amplifier are designed to make amplifier output waveform meet the requirements of the overall design. The circuit is designed and simulated by Multisim, and the simulation results show that all the indexes of the amplifier meet design requirements. This circuit can accurately amplify output signal of charge pulse detector and output corresponding quasi-Gaussian pulse shaping waveforms for subsequent processing to provide reliable signal, which has some applicability.