WSEAS Transactions on Biology and Biomedicine
Print ISSN: 1109-9518, E-ISSN: 2224-2902
Volume 13, 2016
Low-Frequency Response of a Multi-Stage Dry-Electrode ECG Bioelectric Amplifier
Authors: ,
Abstract: This paper reports the optimisation of the low-frequency response of a multi-stage bioelectric amplifier intended for use in the measurement of the electrocardiogram (ECG) using un-gelled electrodes. The frequency response was optimised to meet the International Electrotechnical Commission 60601 performance standards for electrocardiographs [1,2]. The low frequency response of a multi-stage amplifier configuration was optimised to meet both time and frequency domain specifications. The optimum circuit 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 0.028Hz and a zero at 0.0028Hz in the first and second stages giving an overall -3dB bandwidth of 0.043Hz. The pole of the input ac coupling network was placed at 0.0028Hz in order to meet the undershoot and recovery slope requirements in the response to a narrow pulse.
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Pages: 124-133
WSEAS Transactions on Biology and Biomedicine, ISSN / E-ISSN: 1109-9518 / 2224-2902, Volume 13, 2016, Art. #15