Effect of electrode impedance in improved buffer amplifier for bioelectric recordings
| Autor: | G.C. Bertran, Esteban R. Valverde, Pedro David Arini, Ricardo A. Quinteiro, Marcelo O. Biagetti |
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| Rok vydání: | 2004 |
| Předmět: |
Dc resistance
BUFFER AMPLIFIER Materials science Biomedical Engineering INGENIERÍAS Y TECNOLOGÍAS Buffers Sensitivity and Specificity Buffer (optical fiber) Electrocardiography Electric Impedance Ingeniería Eléctrica y Electrónica Electrical impedance Electrodes Ingeniería Eléctrica Ingeniería Electrónica e Ingeniería de la Información Amplifiers Electronic business.industry Buffer amplifier Electrical engineering Reproducibility of Results ELECTRODE IMPEDANCE BIOELECTRIC RECORDINGS General Medicine Equipment Design Electrode impedance Equipment Failure Analysis Electrode Damping factor Optoelectronics Computer-Aided Design Instrumentation amplifier business |
| Zdroj: | Journal of medical engineeringtechnology. 28(5) |
| ISSN: | 0309-1902 |
| Popis: | We analyzed the effects of the electrode impedance on the transfer response of a one-stage improved buffer amplifier. The electrode DC resistance (Rd) modifies the one-stage buffer transfer response. We found a limit electrode resistance (Rd(lim)) which depends on the transfer damping factor (∈). If Rd is lower than 86.5 kW, the transfer response of the buffer fulfils the American Heart Association, AHA, recommendations, but when Rd is greater than Rd(lim) it must be cautiously weighted-up because its influence in the transfer response becomes appreciable. The maximum Rd that can be driven by the buffer is 1.2 MW. Higher values never fulfil the AHA recommendations. Therefore, electrodes with higher impedance should not be used with this kind of buffer. On the other hand, when this buffer is used to build-in an instrumentation amplifier (IA) for bipolar recording, the common-mode rejection ratio (CMRR) is sensitive to the electrode type used. Fil: Valverde, Esteban Raul. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Favaloro; Argentina Fil: Arini, Pedro David. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Argentino de Matemática Alberto Calderón; Argentina. Universidad Favaloro; Argentina Fil: Biagetti, Marcelo. Universidad Favaloro; Argentina Fil: Bertran, Guillermo Claudio. Universidad Favaloro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Quinteiro, Ricardo Alberto. Universidad Favaloro; Argentina |
| Databáze: | OpenAIRE |
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