基于热释电红外传感器微弱信号处理电路的设计与分析

摘要

微弱信号处理一直是传感器应用电路中一个棘手的热点问题[1].信号提取的重点则是如何对特定频率的微弱信号实现有效的提取并放大[2-4].文中通过对热释电红外传感器[5-6]探测器出来的信号进行分析,结合设计要求,经过严格的参数计算,对整个信号处理电路进行了合理的分级设计[7],经测试,电路具有良好的选频特性和滤波效果,具有最佳的平坦特性[8],实现了微弱信号的精确放大[9-10].%Weak signal processing is a thorny issue in sensor application circuit.Signal extraction of focus is how to achieve effective specific frequency weak signal amplification and extraction.This paper analyzed the pyroelectric infrared sensors detector out signals,according to the design requirements,through the strict parameters,realized the signal processing circuit for a reasonable grading design.The testing results show the circuit has good frequency selection characteristic and the effect of the filter,and has the best flat characteristic,achieves the accurate weak signal amplification.