access icon openaccess Common-mode noise cancellation circuit for wearable ECG

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 14/10/2016, Accepted 03/01/2017, Revised 14/12/2016, Published 20/04/2017

Wearable electrocardiogram (ECG) is attracting much attention for monitoring heart diseases in healthcare and medical applications. However, an imbalance usually exists between the contact resistances of sensing electrodes, so that a common mode noise caused by external electromagnetic field can be converted into the ECG detection circuit as a differential mode interference voltage. In this study, after explaining the mechanism of how the common mode noise is converted to a differential mode interference voltage, the authors propose a circuit with cadmium sulphide photo-resistors for cancelling the imbalance between the contact resistances and confirm its validity by simulation experiment. As a result, the authors found that the interference voltage generated at the wearable ECG can be effectively reduced to a sufficient small level.

Inspec keywords: biomedical electrodes; patient monitoring; signal denoising; medical signal processing; photoresistors; electrocardiography; diseases; biomedical electronics; cadmium compounds

Other keywords: medical applications; heart disease monitoring; healthcare; electrocardiogram; ECG detection circuit; external electromagnetic field; common-mode noise cancellation; wearable ECG; CdS; cadmium sulphide photoresistors; differential mode interference voltage; contact resistances; sensing electrodes

Subjects: Photoelectric devices; Biology and medical computing; Bioelectric signals; Signal processing and detection; Electrodiagnostics and other electrical measurement techniques; Digital signal processing; Electrical activity in neurophysiological processes

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