Common-mode noise cancellation circuit for wearable ECG

[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.

[学科分类] 肠胃与肝脏病学

[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