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Artículo

Analysis and Simple Circuit Design of Double Differential EMG Active Electrode

Guerrero, Federico NicolásIcon ; Spinelli, Enrique MarioIcon ; Haberman, Marcelo AlejandroIcon
Fecha de publicación: 06/2016
Editorial: Institute of Electrical and Electronics Engineers
Revista: IEEE Transactions On Biomedical Circuits And Systems
ISSN: 1932-4545
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería de Sistemas y Comunicaciones

Resumen

In this paper we present an analysis of the voltage amplifier needed for double differential (DD) sEMG measurements and a novel, very simple circuit for implementing DD active electrodes. The three-input amplifier that standalone DD active electrodes require is inherently different from a differential amplifier, and general knowledge about its design is scarce in the literature. First, the figures of merit of the amplifier are defined through a decomposition of its input signal into three orthogonal modes. This analysis reveals a mode containing EMG crosstalk components that the DD electrode should reject. Then, the effect of finite input impedance is analyzed. Because there are three terminals, minimum bounds for interference rejection ratios due to electrode and input impedance unbalances with two degrees of freedom are obtained. Finally, a novel circuit design is presented, including only a quadruple operational amplifier and a few passive components. This design is nearly as simple as the branched electrode and much simpler than the three instrumentation amplifier design, while providing robust EMG crosstalk rejection and better input impedance using unity gain buffers for each electrode input. The interference rejection limits of this input stage are analyzed. An easily replicable implementation of the proposed circuit is described, together with a parameter design guideline to adjust it to specific needs. The electrode is compared with the established alternatives, and sample sEMG signals are obtained, acquired on different body locations with dry contacts, successfully rejecting interference sources.
Palabras clave: Active Electrodes , Biomedical Sensors , Double Differential Electrodes , Dry Electrodes , Surface Electromyography
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54778
DOI: http://dx.doi.org/10.1109/TBCAS.2015.2492944
URL: https://ieeexplore.ieee.org/document/7362246/
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
Guerrero, Federico Nicolás; Spinelli, Enrique Mario; Haberman, Marcelo Alejandro; Analysis and Simple Circuit Design of Double Differential EMG Active Electrode; Institute of Electrical and Electronics Engineers; IEEE Transactions On Biomedical Circuits And Systems; 10; 3; 6-2016; 787-795
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