IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
Special Issue Paper
Common-mode Noise Reduction Circuit Design for Biosignal Acquisition System—in Comparison with the DRL
Minghui ChenJianqing WangDaisuke AnzaiGeorg Fischer
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2019 Volume 139 Issue 12 Pages 657-662

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Abstract

Common-mode (CM) noise is a primary interference to biological signal (biosignal) detection systems, but is hardly solved with passive filtering. Conventionally, a driven-right-leg (DRL) circuit is employed to drive down the CM noise level. In this work, We first clarified how much influence an imbalance in the contact resistance could have for three different kinds of circuits, and then proposed a novel design of imbalance cancellation circuit using the digital potentiometer(digiPOT). Simulation evaluations were performed and the results showed that our circuit design can exceed the DRL by more than 20 dB in reducing the CM noise under the same conditions.

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© 2019 by the Institute of Electrical Engineers of Japan
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