ZHOU Mingjuan1, WANG Yuyuan1, RAN Li2
（1. Shaanxi Railway Institute, Weinan 714000， China；2. Xi’an University of Technology, Xi’an 710048， China）
Abstract： A surface electromyography (sEMG) signal acquisition circuit based on high-order filtering is designed. We use a two-stage adjustable amplifier and a high-order Sallen-Key bandpass filter to solve the problems of non-adjustable amplification gain and low filtering order in traditional acquisition circuits. The experimental results show that the designed sEMG signal acquisition device can eliminate power frequency interference effectively, the stopband drop of the filtering part reaches approximately -100 dB/dec, which can effectively extract useful signals between 20-500 Hz, and the amplification gain reaches 60 dB.
Key words： surface electromyography (sEMG); two-stage amplification; high-order filtering; interference suppression; power frequency noise
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一种表面肌电信号采集装置的实现
周明娟1， 王语园1， 冉蠡2
（1. 陕西铁路工程职业技术学院， 陕西 渭南 714000； 2. 西安理工大学， 陕西 西安 710048）
摘要：为了更有效地采集到表面肌电信号（Surface elctromyography, sEMG）， 设计了一种基于高阶滤波的sEMG信号采集装置。 两级可调放大电路及高阶Sallen-Key带通滤波器解决了传统sEMG信号采集电路中放大增益不可调、滤波阶数较低等问题。 实验结果表明， 所设计的sEMG采集装置可以很好地抑制工频干扰， 滤波部分阻带下降近似达到-100 dB/dec， 可以有效提取20-500 Hz之间的有用信号， 放大增益可达60 dB。
关键词：表面肌电信号； 两级放大； 高阶滤波； 抑制干扰； 工频噪声
引用格式：ZHOU Mingjuan, WANG Yuyuan, RAN Li. Design of a weak bioelectric signal acquisition circuit. Journal of Measurement Science and Instrumentation, 2021, 12（1）： 20-26. DOI： 10．3969／j．issn．1674-8042．2021．01．003
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