基于光斑跟踪器的脉冲峰值保持电路的实现

Implementation of pulse peak holding circuit based on laser spot tracker

针对激光光斑跟踪器接收信号处理系统中常规A/D采样电路对脉冲电压峰值采集的技术要求,设计了一种脉冲峰值保持电路。通过对该峰值保持电路的各项指标进行理论分析,采用宽带宽跨导放大器MAX436设计该峰值保持电路,并对该电路进行了仿真分析与实验研究,得到满足参数指标设计要求的实验结果:对于脉宽50ns的激光脉冲信号,在输入信号幅度大于100mV时,峰值保持电路的响应速度≤2ns,下垂速率≤6.0mV/μs,保持精度≤1.1%。

A kind of pulse peak holding circuit was designed to fulfill the technical demands of conventional A/D sampling circuit to capture peak voltage in the reception signal processing system of laser spot trackers. Firstly, several technical specifications of the holding circuit were analyzed theoretically and the MAX436, a high-speed and wideband trans-conductance amplifier, was effectively chosen to lay out the circuit. Following, the simulation analysis and experimental research were done to get experimental results that could meet the technical demands. For the laser pulse signal of 50ns pulse-width, the response speed of the peak holding circuit≤2 ns, the relative error≤1. 1% and the droop speed rate≤6.0 mV/s, when the amplitude of input signal≥100 inV. Key words： laser spot trackers; peak holding circuit; laser pulse; response time