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A comprehensive model for power line interference in biopotential measurements
Fernández Chimeno, Mireya; Pallàs Areny, Ramon
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. GRUP ISI - Grup d´Instrumentació, sensors i interfícies; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica
Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are quite effective in reducing power-line interference but do not completely eliminate it. We propose a model that includes both interference external to the measuring system and interference coming from its internal power supply. Moreover, the model considers interference directly coupled to the measuring electrodes, because, as opposed to connecting leads, electrodes are not usually shielded. Experimental results confirm that reducing interference coupled through electrodes yields a negligible interference. The proposed model can be applied to other differential measurement systems, particulary those involving electrodes or sensors placed far apart.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics
Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
Amplifiers (Electronics)
Medical electronics
Electric interference
Biomedical measurements
Amplificadors (Electrònica)
Interferència elèctrica
Institute of Electrical and Electronics Engineers

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