Publication Type:

Conference Paper

Source:

TENCON 2014 - 2014 IEEE Region 10 Conference (2014)

ISBN:

9781479940752

Accession Number:

14885779

Keywords:

alternating current-coupled front end, amplifiers, bioelectric potentials, biomedical electrodes, Capacitance, Capacitive, capacitive ECG system, Capacitive electrodes, capacitive sensors, Cardiovascular function, Cardiovascular system, Contactless, contactless ECG signal, contactless ECG simulation, contactless ECG system analysis, coupled circuits, dc rejection, direct current decoupling, ECG, electrocardiogram, Electrocardiography, Electrodes, high-gain amplifier, Impedance, Instruments, Materials, Resistance, signal quality

Abstract:

The electrocardiogram (ECG) is one of the primary sources of information for assessing cardiovascular function. Conventional ECG systems are not suitable for continuous, long-term monitoring. Contactless measurement of ECG using capacitive sensors is emerging as an attractive alternative. One of the disadvantages of a contactless system is that the signal quality is poor as far as the clinical acceptance of the system is concerned. The contactless ECG signal typically contains a relatively large amount of dc, due to electrode offset or artifacts, which would drive the front end of the high-gain amplifier into saturation. Hence, what is required is a circuit that would effectively block dc while coupling the differential ac signal. A circuit developed for conventional ECG systems has been made use of, for this purpose. This paper describes the simulation and analysis of a contactless ECG monitoring system, using capacitive electrodes, with an ac-coupled front end for effective dc decoupling. The performance of the circuit is studied for different material and thicknesses of clothing.

Cite this Research Publication

K. R. Sandra, Anusha, A. S., Dr. Madhu Mohan N., and George, B., “Simulation study of a contactless, capacitive ECG system”, in TENCON 2014 - 2014 IEEE Region 10 Conference, 2014.

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