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An alternate voltage-controlled current source for electrical impedance tomography applications

The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be us...

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Main Authors: Chitturi, V., Farrukh, N.
Format: Conference Paper
Language:English
Published: 2020
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spelling my.uniten.dspace-132892020-03-17T05:23:39Z An alternate voltage-controlled current source for electrical impedance tomography applications Chitturi, V. Farrukh, N. The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be used as a voltage-controlled current source using IC LM7171 op-amp. A constant current of 5 mA (PP) is designed and tested over a wide range of frequencies. The frequency response indicates a stable current up to 1 MHz. These results are validated for an impedance of 1 kΩ which is usually considered for EIT applications. A buffer circuit is added to this current circuit to meet high output impedance matching. A minor discrepancy is visible between the theoretical value and measured value of the output current due to the tolerance band of the resistors used in the non-inverting amplifier circuit. © Springer Nature Singapore Pte Ltd 2019. 2020-02-03T03:31:35Z 2020-02-03T03:31:35Z 2019 Conference Paper 10.1007/978-981-13-2514-4_8 en
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
language English
description The desirable features of any current source in electrical impedance tomography (EIT) are high output impedance and a constant current for varying loads. Howland current sources are the most popular current sources for EIT applications. Alternately, a simple non-inverting amplifier circuit can be used as a voltage-controlled current source using IC LM7171 op-amp. A constant current of 5 mA (PP) is designed and tested over a wide range of frequencies. The frequency response indicates a stable current up to 1 MHz. These results are validated for an impedance of 1 kΩ which is usually considered for EIT applications. A buffer circuit is added to this current circuit to meet high output impedance matching. A minor discrepancy is visible between the theoretical value and measured value of the output current due to the tolerance band of the resistors used in the non-inverting amplifier circuit. © Springer Nature Singapore Pte Ltd 2019.
format Conference Paper
author Chitturi, V.
Farrukh, N.
spellingShingle Chitturi, V.
Farrukh, N.
An alternate voltage-controlled current source for electrical impedance tomography applications
author_facet Chitturi, V.
Farrukh, N.
author_sort Chitturi, V.
title An alternate voltage-controlled current source for electrical impedance tomography applications
title_short An alternate voltage-controlled current source for electrical impedance tomography applications
title_full An alternate voltage-controlled current source for electrical impedance tomography applications
title_fullStr An alternate voltage-controlled current source for electrical impedance tomography applications
title_full_unstemmed An alternate voltage-controlled current source for electrical impedance tomography applications
title_sort alternate voltage-controlled current source for electrical impedance tomography applications
publishDate 2020
_version_ 1662758841582878720
score 13.211869

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