Bio-potential amplifier for potential gradient measurements

This work proposes a bio-potential amplifier suitable for measurements from an electric potential gradient sensor, in electro-encephalography (EEG). The sensor is an array made by three electrodes placed on the vertices of an equilateral triangle of reduced size. Measuring the gradient requires smal...

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Detalles Bibliográficos
Autores principales: Bermúdez Cicchino, Andrea Noelia, Spinelli, Enrique Mario, Muravchik, Carlos Horacio
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2007
Materias:
Física
Ciencias Exactas
Electro-encephalography
Amplificadores
Bio-potencial
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84832
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84832
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Ciencias Exactas
Electro-encephalography
Amplificadores
Bio-potencial
spellingShingle Física
Ciencias Exactas
Electro-encephalography
Amplificadores
Bio-potencial
Bermúdez Cicchino, Andrea Noelia
Spinelli, Enrique Mario
Muravchik, Carlos Horacio
Bio-potential amplifier for potential gradient measurements
topic_facet Física
Ciencias Exactas
Electro-encephalography
Amplificadores
Bio-potencial
description This work proposes a bio-potential amplifier suitable for measurements from an electric potential gradient sensor, in electro-encephalography (EEG). The sensor is an array made by three electrodes placed on the vertices of an equilateral triangle of reduced size. Measuring the gradient requires small separation between electrodes hence, very low amplitude signals, of a few μV, are obtained. Therefore, it is important to minimize amplifier noise and electromagnetic interference effects. In the proposed scheme, the first stage is a passive and balanced ac-coupling network adapted to the gradient configuration and the second stage is an 80 dB gain amplifier. The implementation requires a reduced number of components. Therefore, the circuit can be mounted just above the electrodes (active electrodes). The proposed amplifier was built and tested. It achieves a CMRR of 125dB at 50 Hz and an equivalent input noise voltage of 0,3μV RMS in the band 0.5 - 500 Hz. Finally, some preliminary results in the detection of occipital alpha rhythm are presented.
format Objeto de conferencia
Objeto de conferencia
author Bermúdez Cicchino, Andrea Noelia
Spinelli, Enrique Mario
Muravchik, Carlos Horacio
author_facet Bermúdez Cicchino, Andrea Noelia
Spinelli, Enrique Mario
Muravchik, Carlos Horacio
author_sort Bermúdez Cicchino, Andrea Noelia
title Bio-potential amplifier for potential gradient measurements
title_short Bio-potential amplifier for potential gradient measurements
title_full Bio-potential amplifier for potential gradient measurements
title_fullStr Bio-potential amplifier for potential gradient measurements
title_full_unstemmed Bio-potential amplifier for potential gradient measurements
title_sort bio-potential amplifier for potential gradient measurements
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/84832
work_keys_str_mv AT bermudezcicchinoandreanoelia biopotentialamplifierforpotentialgradientmeasurements
AT spinellienriquemario biopotentialamplifierforpotentialgradientmeasurements
AT muravchikcarloshoracio biopotentialamplifierforpotentialgradientmeasurements
bdutipo_str Repositorios
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