传感技术学报2018，Vol.31Issue(1)：54-60,7.DOI:10.3969/j.issn.1004-1699.2018.01.010
基于高阶滤波的肌电信号采集电路设计
Design of EMG Signal Acquisition Circuit Based on High-Order Filter
摘要
Abstract
A sEMG signal acquisition circuit with high common mode rejection ratio,flexible amplification and good anti-noise performance is designed in view of the sEMG characterized by low frequency and weak signal vulnerable to interference. The amplified part of the signal uses a two-stage amplification scheme to avoid the problem that the noise is excessively enlarged to cause the EMG signal to be submerged. The band-pass filter section composed of two groups of 5-order Sallen-Key low-pass and high-pass filtering circuits makes the stop-band decrease rapidly,approximately to-100 dB/( °) ,so as to attenuate the noise and other physiological signal interference to a large extent. For the power frequency interference problem,this design sets the Q value adjustment potentiometer in the trap part,adjusting the potentiometer to obtain the best collection effect according to the actual situation. The test results show that this design with amplifier gain up to 60dB has a good inhibitory effect of 50 Hz interference,can effectively extract the useful sig-nal between 20 Hz～500 Hz,and has a good anti-noise performance.关键词
肌电信号/信号采集/差分放大/高阶滤波/工频滤除/噪声抑制Key words
surface electromyography/signal acquisition/differential amplification/high-order filtering/filtering the power frequency/noise suppression分类
信息技术与安全科学引用本文复制引用
周明娟,逯迈..基于高阶滤波的肌电信号采集电路设计[J].传感技术学报,2018,31(1):54-60,7.基金项目
项目来源:国家自然科学基金项目( 51267010 （）
51567015) （）
