A fully-differential biopotential amplifier with a reduced number of parts

Objective: Fully differential topologies are wellsuited for biopotential amplifiers, mainly for single-supply battery-powered circuits such as portable wearable devices where a reduced number of parts is desired. A novel fully differential biopotential amplifier is proposed with the goal of providin...

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Detalles Bibliográficos
Autores principales: Spinelli, Enrique Mario, García, Pablo Andrés, Guerrero, Federico Nicolás, Catacora, Valentín Andrés, Haberman, Marcelo Alejandro
Formato: Articulo
Lenguaje:Inglés
Publicado: 2022
Materias:
Ingeniería Electrónica
Biopotential measurement
fully-differential amplifier
low cost design
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/156595
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-156595
record_format dspace
spelling I19-R120-10915-1565952023-08-19T20:07:48Z http://sedici.unlp.edu.ar/handle/10915/156595 A fully-differential biopotential amplifier with a reduced number of parts Spinelli, Enrique Mario García, Pablo Andrés Guerrero, Federico Nicolás Catacora, Valentín Andrés Haberman, Marcelo Alejandro 2022 2023-08-18T16:35:43Z en Ingeniería Electrónica Biopotential measurement fully-differential amplifier low cost design Objective: Fully differential topologies are wellsuited for biopotential amplifiers, mainly for single-supply battery-powered circuits such as portable wearable devices where a reduced number of parts is desired. A novel fully differential biopotential amplifier is proposed with the goal of providing electrode offset rejection, bandwidth limitation, and a temporal response compliant with biomedical standards with only a single commercial quad operational amplifier (OA) integrated circuit. Methods: A novel compensation strategy was used to provide a transfer function with only one zero at the origin, which makes it easy to comply with the transient response imposed by biomedical standards. A topology with no grounded components was leveraged to obtain a common-mode rejection ratio (CMRR) ideally infinite and independent of components mismatches. Results: Design equations are presented and, as an example, an electrocardiogram (ECG) amplifier was built and tested. It features a CMRR of 102 dB at 50 Hz, 55 dB gain that supports DC input voltages up to ±300 mV when powered from a 0 V to 5 V single-supply voltage, and a cutoff frequency of less than 0.05 Hz with a first order response. Conclusion: A fully-differential biopotential front-end was designed and validated through experimental tests, demonstrating proper operation with only 4 OAs. Significance: The amplifier is intended for board-level design solutions, it can be built with off-the-shelf components that can be selected according to specific needs, such as reduced power consumption, low noise, or proper operation from a low-voltage power source. Instituto de Investigaciones en Electrónica, Control y Procesamiento de Señales Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Electrónica
Biopotential measurement
fully-differential amplifier
low cost design
spellingShingle Ingeniería Electrónica
Biopotential measurement
fully-differential amplifier
low cost design
Spinelli, Enrique Mario
García, Pablo Andrés
Guerrero, Federico Nicolás
Catacora, Valentín Andrés
Haberman, Marcelo Alejandro
A fully-differential biopotential amplifier with a reduced number of parts
topic_facet Ingeniería Electrónica
Biopotential measurement
fully-differential amplifier
low cost design
description Objective: Fully differential topologies are wellsuited for biopotential amplifiers, mainly for single-supply battery-powered circuits such as portable wearable devices where a reduced number of parts is desired. A novel fully differential biopotential amplifier is proposed with the goal of providing electrode offset rejection, bandwidth limitation, and a temporal response compliant with biomedical standards with only a single commercial quad operational amplifier (OA) integrated circuit. Methods: A novel compensation strategy was used to provide a transfer function with only one zero at the origin, which makes it easy to comply with the transient response imposed by biomedical standards. A topology with no grounded components was leveraged to obtain a common-mode rejection ratio (CMRR) ideally infinite and independent of components mismatches. Results: Design equations are presented and, as an example, an electrocardiogram (ECG) amplifier was built and tested. It features a CMRR of 102 dB at 50 Hz, 55 dB gain that supports DC input voltages up to ±300 mV when powered from a 0 V to 5 V single-supply voltage, and a cutoff frequency of less than 0.05 Hz with a first order response. Conclusion: A fully-differential biopotential front-end was designed and validated through experimental tests, demonstrating proper operation with only 4 OAs. Significance: The amplifier is intended for board-level design solutions, it can be built with off-the-shelf components that can be selected according to specific needs, such as reduced power consumption, low noise, or proper operation from a low-voltage power source.
format Articulo
Articulo
author Spinelli, Enrique Mario
García, Pablo Andrés
Guerrero, Federico Nicolás
Catacora, Valentín Andrés
Haberman, Marcelo Alejandro
author_facet Spinelli, Enrique Mario
García, Pablo Andrés
Guerrero, Federico Nicolás
Catacora, Valentín Andrés
Haberman, Marcelo Alejandro
author_sort Spinelli, Enrique Mario
title A fully-differential biopotential amplifier with a reduced number of parts
title_short A fully-differential biopotential amplifier with a reduced number of parts
title_full A fully-differential biopotential amplifier with a reduced number of parts
title_fullStr A fully-differential biopotential amplifier with a reduced number of parts
title_full_unstemmed A fully-differential biopotential amplifier with a reduced number of parts
title_sort fully-differential biopotential amplifier with a reduced number of parts
publishDate 2022
url http://sedici.unlp.edu.ar/handle/10915/156595
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