[1]周明娟,王语园,王田戈,等.针对微弱表面肌电信号的采集电路设计[J].中国医学物理学杂志,2021,38(5):625-630.[doi:DOI:10.3969/j.issn.1005-202X.2021.05.019]
　ZHOU Mingjuan,WANG Yuyuan,WANG Tiange,et al.Design of acquisition circuit for weak surface electromyography signals[J].Chinese Journal of Medical Physics,2021,38(5):625-630.[doi:DOI:10.3969/j.issn.1005-202X.2021.05.019]
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针对微弱表面肌电信号的采集电路设计()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
38卷
期数:
2021年第5期
页码:
625-630
栏目:
医学信号处理与医学仪器
出版日期:
2021-05-01

文章信息/Info

Title:
Design of acquisition circuit for weak surface electromyography signals
文章编号:
1005-202X（2021）05-0625-06
作者:
周明娟1; 王语园1; 王田戈1; 冉蠡2
1.陕西铁路工程职业技术学院， 陕西 渭南 714000； 2.西安理工大学水利水电学院， 陕西 西安 710048
Author(s):
ZHOU Mingjuan1;  WANG Yuyuan1;  WANG Tiange1;  RAN Li2
1. Shanxi Railway Institute, Weinan 714000, China 2. School of Water Resources and Hydropower, Xian University of Technology, Xian 710048, China
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
Keywords:
Keywords: surface electromyography signal two-stage amplification high-order filtering interference suppression power-line noise
分类号:
R318
DOI:
DOI:10.3969/j.issn.1005-202X.2021.05.019
文献标志码:
A
摘要:
表面肌电信号频率低、极易受干扰，针对此设计基于高阶滤波的信号采集电路。为避免噪声被过度放大而造成信号淹没，电路采用两级放大方案。带通滤波部分采用两组5阶Sallen-Key，以奇次在前、偶次在后的顺序级联，避免输出信号中混入高频泄露信号，且阻带下降速度达-100 dB/dec。此外，陷波器部分设置可调电位器，灵活调整品质因数（Q值），以获得最佳采集效果。结果表明，该电路可实现高达60 dB的放大增益，可有效提取20~500 Hz之间的有用信号，同时很好地抑制50 Hz工频干扰，具有良好的抗噪声性能。
Abstract:
Abstract: Considering that surface electromyography signals (sEMG) has low frequency and is extremely vulnerable to interference, a signal acquisition circuit based on high-order filtering is designed. A two-stage amplification scheme is adopted in circuit for preventing the noise from being over-amplified. Two sets of 5th-order Sallen-Key is used in band-pass filtering, and the cascaded follows the order of odd first and even second, thereby avoiding mixing high-frequency leakage signals in the output signal and the stop-band descent speed reaches -100 dB/dec. In addition, the notch filter is equipped with an adjustable potentiometer to flexibly adjust the quality factor (Q value) in order to obtain the optimal signal acquisition. The results show that the circuit can not only achieve an amplification gain up to 60 dB, effectively extracting useful signals between 20 Hz and 500 Hz, but also effectively suppresses 50 Hz power-line interference, with a good anti-noise performance.

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备注/Memo

备注/Memo:
【收稿日期】2021-01-12 【基金项目】渭南市科技计划项目（2020ZDYF-JCYJ-177）；陕西铁路工程职业技术学院供电科技创新团队（KJTD201901）；2019年陕西铁路工程职业技术学院中青年科技人才培育项目（KJRC201905）；陕西铁路工程职业技术学院科研基金研究生专项计划资助项目（KY2018-77） 【作者简介】周明娟，硕士，研究方向：生物医学电磁学，E-mail: zhoumj0202@126.com
更新日期/Last Update: 2021-05-31