Common-mode noise cancellation circuit for wearable ECG

Area of Science:

• Biomedical Engineering
• Medical Devices
• Signal Processing

Background:

• Wearable electrocardiogram (ECG) devices are crucial for remote heart disease monitoring.
• Imbalanced electrode contact resistances in ECG systems convert common mode noise into differential interference.
• This interference degrades the accuracy of ECG signal detection.

Purpose of the Study:

• To explain the mechanism of common mode noise conversion in wearable ECG.
• To propose a novel circuit for cancelling electrode contact resistance imbalance.
• To validate the effectiveness of the proposed circuit in reducing interference.

Main Methods:

• Detailed explanation of the common mode noise to differential mode interference conversion mechanism.
• Design and simulation of a circuit incorporating cadmium sulphide photo-resistors.
• Experimental validation of the circuit's performance through simulation.

Main Results:

• The proposed circuit effectively cancels the imbalance in electrode contact resistances.
• Simulation results confirm significant reduction in differential mode interference voltage.
• The interference voltage in wearable ECG systems was reduced to a sufficiently low level.

Conclusions:

• The cadmium sulphide photo-resistor circuit is a viable solution for mitigating noise in wearable ECG.
• This technology can enhance the reliability and accuracy of remote cardiac monitoring.
• Further development could lead to more robust and precise wearable health devices.