Common-mode noise cancellation circuit for wearable ECG

Healthcare Technology Letters

article

Mutsumi Noro¹  Daisuke Anzai¹  Jianqing Wang¹ 

[1] Nagoya Institute of Technology

关键词: electrocardiography;    medical signal processing;    signal denoising;    diseases;    patient monitoring;    biomedical electrodes;    photoresistors;    cadmium compounds;    biomedical electronics;    common-mode noise cancellation;    wearable ECG;    electrocardiogram;    heart disease monitoring;    healthcare;    medical applications;    contact resistances;    sensing electrodes;    external electromagnetic field;    ECG detection circuit;    differential mode interference voltage;    cadmium sulphide photoresistors;    CdS;   

DOI  :  10.1049/htl.2016.0083

学科分类：肠胃与肝脏病学

来源: Wiley

【 摘 要 】

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.

【 授权许可】

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