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

Chen M, Wang J, Anzai D, Fischer G, Kirchner J (2020)

Publication Type: Journal article, Original article

Publication year: 2020

Journal

Sensors MDPI

URI: https://www.mdpi.com/1424-8220/20/24/7140/pdf

DOI: 10.3390/s20247140

Open Access Link: https://www.mdpi.com/1424-8220/20/24/7140/pdf

Abstract

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.

Authors with CRIS profile

Georg Fischer Professur für Technische Elektronik Jens Kirchner Lehrstuhl für Technische Elektronik (LTE)

Additional Organisation(s)

Graduiertenkolleg 2495/2 Energiekonvertierungssysteme: von Materialien zu Bauteilen (Energy Conversion Systems: From Materials to Devices)

Involved external institutions

Nagoya Institute of Technology / 名古屋工業大学 Nagoya Kōgyō Daigaku JP Japan (JP)

How to cite

APA:

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

MLA:

Chen, Minghui, et al. "Common-Mode Noise Reduction in Noncontact Biopotential Acquisition Circuit Based on Imbalance Cancellation of Electrode-Body Impedance." Sensors (2020).

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