AC-coupled front-end for biopotential measurements

AC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of a dc-coupled front end to prevent amplifier saturation. A high-gain input stage...

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Detalles Bibliográficos
Autores principales: Spinelli, Enrique Mario, Pallas Areny, Ramón, Mayosky, Miguel Angel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Ingeniería
AC coupling
biopotential amplifiers
electrode offset potential
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127283
https://ieeexplore.ieee.org/document/1186743
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127283
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería
AC coupling
biopotential amplifiers
electrode offset potential
spellingShingle Ingeniería
AC coupling
biopotential amplifiers
electrode offset potential
Spinelli, Enrique Mario
Pallas Areny, Ramón
Mayosky, Miguel Angel
AC-coupled front-end for biopotential measurements
topic_facet Ingeniería
AC coupling
biopotential amplifiers
electrode offset potential
description AC coupling is essential in biopotential measurements. Electrode offset potentials can be several orders of magnitude larger than the amplitudes of the biological signals of interest, thus limiting the admissible gain of a dc-coupled front end to prevent amplifier saturation. A high-gain input stage needs ac input coupling. This can be achieved by series capacitors, but in order to provide a bias path, grounded resistors are usually included, which degrade the common mode rejection ratio (CMRR). This paper proposes a novel balanced input ac-coupling network that provides a bias path without any connection to ground, thus resulting in a high CMRR. The circuit being passive, it does not limit the differential dc input voltage. Furthermore, differential signals are ac coupled, whereas common-mode voltages are dc coupled, thus allowing the closed-loop control of the dc common mode voltage by means of a driven-right-leg circuit. This makes the circuit compatible with common-mode dc shifting strategies intended for single-supply biopotential amplifiers. The proposed circuit allows the implementation of high-gain biopotential amplifiers with a reduced number of parts, thus resulting in low power consumption. An electrocardiogram amplifier built according to the proposed design achieves a CMRR of 123 dB at 50 Hz.
format Articulo
Articulo
author Spinelli, Enrique Mario
Pallas Areny, Ramón
Mayosky, Miguel Angel
author_facet Spinelli, Enrique Mario
Pallas Areny, Ramón
Mayosky, Miguel Angel
author_sort Spinelli, Enrique Mario
title AC-coupled front-end for biopotential measurements
title_short AC-coupled front-end for biopotential measurements
title_full AC-coupled front-end for biopotential measurements
title_fullStr AC-coupled front-end for biopotential measurements
title_full_unstemmed AC-coupled front-end for biopotential measurements
title_sort ac-coupled front-end for biopotential measurements
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/127283
https://ieeexplore.ieee.org/document/1186743
work_keys_str_mv AT spinellienriquemario accoupledfrontendforbiopotentialmeasurements
AT pallasarenyramon accoupledfrontendforbiopotentialmeasurements
AT mayoskymiguelangel accoupledfrontendforbiopotentialmeasurements
bdutipo_str Repositorios
_version_ 1764820451541909505

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