心电采集电路的设计与实现

Design and implementation of detection circuit for electrocardiogram

介绍一种心电采集检测电路的设计,该设计以AD620和OP07为核心元件,针对心电信号的组成和干扰频率范围,进行了分析,对由电极采集到的心电信号,通过前置放大电路将微弱的心电心电信号放大,并通过低通滤波器、高通滤波器、及50Hz陷波电路滤除干扰最后通过后置放大电路进一步放大得到清晰的心电波形。系统具有高输入阻抗、高共模抑制比、低噪声、低漂移、和高信噪比、成本低等优点。

This paper introduces a specifice design of detection circuit in ECG acquisition system.This design employes AD620 and OP07 as its core.Through the major components of the ECG signal and the frequency range of interference were analysed,weak ECG signal collected by the electrodes was amplified by the preamplifier circuit,and then was filtered out the interference by using a low-pass filer,a high-pass filer,50Hz notch filer and back amplifier circuit,finally a right wave of ECG was gotten.The characteristics of the system show in the merits of high input impedance,high CMRR,low noise,less excursion and high SNR（signal to noise ratio）,low cost and so on.