MATEC Web Conf.
Volume 125, 201721st International Conference on Circuits, Systems, Communications and Computers (CSCC 2017)
|Number of page(s)||6|
|Published online||04 October 2017|
Transient Response of Low-Power ECG Recoding Amplifiers for Use with Un-gelled Electrodes
Dept. of Electronic and Electrical Engineering, Trinity College, University of Dublin, College Green, Dublin 2, Ireland
a Corresponding author: email@example.com
This paper addresses the design of the low-frequency response of a multi-stage bioelectric amplifier intended for use in the measurement of the human electrocardiogram (ECG) using high-impedance un-gelled electrodes. The response is optimised to meet the International Electrotechnical Commission 60601 standards [1, 2] for electrocardiograph recorders in both the time and frequency domains. The optimum design for a three stage amplifier, having two differential stages and a differential-to-single-ended conversion stage was established in the context of low-power ambulatory ECG monitoring. The optimum configuration was found to be two differential stages with a gain of 20dB each and a differential-to single-ended output stage with unity gain. The −3dB pole is placed at 0.013Hz and a zero at 0.0013Hz in the first and second stages to give an overall −3dB low cut-off frequency of 0.02Hz. In addition, the pole of the input ac coupling network was placed at 0.0013Hz in order to cancel the zero in the non-inverting front-end stage. This ensured that undershoot and recovery slope performance requirements in response to a narrow pulse of 3mV amplitude and 100ms duration were met.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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