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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Autores: Spinelli, Enrique M., Mayosky, Miguel Ángel, Pallàs-Areny, Ramon|||0000-0002-0430-5309
Formato: artículo
Fecha de publicación:2003
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/1300
Acesso em linha:https://hdl.handle.net/2117/1300
Access Level:acceso abierto
Palavra-chave:Electrodes
Amplifiers (Electronics)
AC coupling
Biopotential amplifiers
Amplificadors
Elèctrodes
Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura
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oai_identifier_str oai:upcommons.upc.edu:2117/1300
network_acronym_str ES
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repository_id_str
spelling AC-coupled front-end for biopotential measurementsSpinelli, Enrique M.Mayosky, Miguel ÁngelPallàs-Areny, Ramon|||0000-0002-0430-5309ElectrodesAmplifiers (Electronics)AC couplingBiopotential amplifiersAmplificadorsElèctrodesÀrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesuraAC 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 HzPeer ReviewedInstitute of Electrical and Electronics Engineers20032003-03-0120072007-11-06journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/1300reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/13002026-05-27T15:37:01Z
dc.title.none.fl_str_mv AC-coupled front-end for biopotential measurements
title AC-coupled front-end for biopotential measurements
spellingShingle AC-coupled front-end for biopotential measurements
Spinelli, Enrique M.
Electrodes
Amplifiers (Electronics)
AC coupling
Biopotential amplifiers
Amplificadors
Elèctrodes
Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura
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
dc.creator.none.fl_str_mv Spinelli, Enrique M.
Mayosky, Miguel Ángel
Pallàs-Areny, Ramon|||0000-0002-0430-5309
author Spinelli, Enrique M.
author_facet Spinelli, Enrique M.
Mayosky, Miguel Ángel
Pallàs-Areny, Ramon|||0000-0002-0430-5309
author_role author
author2 Mayosky, Miguel Ángel
Pallàs-Areny, Ramon|||0000-0002-0430-5309
author2_role author
author
dc.subject.none.fl_str_mv Electrodes
Amplifiers (Electronics)
AC coupling
Biopotential amplifiers
Amplificadors
Elèctrodes
Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura
topic Electrodes
Amplifiers (Electronics)
AC coupling
Biopotential amplifiers
Amplificadors
Elèctrodes
Àrees temàtiques de la UPC::Enginyeria electrònica::Instrumentació i mesura
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
publishDate 2003
dc.date.none.fl_str_mv 2003
2003-03-01
2007
2007-11-06
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/1300
url https://hdl.handle.net/2117/1300
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422901659172864
score 15,300719

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