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Article

Common-Mode Noise Reduction in Noncontact Biopotential Acquisition Circuit Based on Imbalance Cancellation of Electrode-Body Impedance

1
Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
2
Institute for Electronics Engineering, Friedrich-Alexander-Universität of Erlangen-Nuremberg, Schlossplatz 4, 91054 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(24), 7140; https://doi.org/10.3390/s20247140
Received: 9 November 2020 / Revised: 29 November 2020 / Accepted: 10 December 2020 / Published: 13 December 2020
(This article belongs to the Special Issue Biomedical Signal Acquisition and Processing Using Sensors)
Biopotential sensing technology with electrodes has a great future in medical treatment and human—machine interface, whereas comfort and longevity are two significant problems during usage. Noncontact electrode is a promising alternative to achieve more comfortable and long term biopotential signal recordings than contact electrode. However, it could pick up a significantly higher level of common-mode (CM) noise, which is hardly solved with passive filtering. The impedance imbalance at the electrode-body interface is a limiting factor of this problem, which reduces the common mode rejection ratio (CMRR) of the amplifier. In this work, we firstly present two novel CM noise reduction circuit designs. The circuit designs are based on electrode-body impedance imbalance cancellation. We perform circuit analysis and circuit simulations to explain the principles of the two circuits, both of which showed effectiveness in CM noise rejection. Secondly, we proposed a practical approach to detect and monitor the electrode-body impedance imbalance change. Compared with the conventional approach, it has certain advantages in interference immunity, and good linearity for capacitance. Lastly, we show experimental evaluation results on one of the designs we proposed. The results indicated the validity and feasibility of the approach. View Full-Text
Keywords: biomedical electronics; common-mode noise; electromagnetic interference; noncontact electrode biomedical electronics; common-mode noise; electromagnetic interference; noncontact electrode
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MDPI and ACS Style

Chen, M.; Wang, J.; Anzai, D.; Fischer, G.; Kirchner, J. Common-Mode Noise Reduction in Noncontact Biopotential Acquisition Circuit Based on Imbalance Cancellation of Electrode-Body Impedance. Sensors 2020, 20, 7140. https://doi.org/10.3390/s20247140

AMA Style

Chen M, Wang J, Anzai D, Fischer G, Kirchner J. Common-Mode Noise Reduction in Noncontact Biopotential Acquisition Circuit Based on Imbalance Cancellation of Electrode-Body Impedance. Sensors. 2020; 20(24):7140. https://doi.org/10.3390/s20247140

Chicago/Turabian Style

Chen, Minghui, Jianqing Wang, Daisuke Anzai, Georg Fischer, and Jens Kirchner. 2020. "Common-Mode Noise Reduction in Noncontact Biopotential Acquisition Circuit Based on Imbalance Cancellation of Electrode-Body Impedance" Sensors 20, no. 24: 7140. https://doi.org/10.3390/s20247140

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