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Comparison of Howland and General Impedance Converter (GIC) circuit based current sources for bio-impedance measurements

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posted on 2023-06-08, 12:18 authored by Tabassum-Ur-Razaq Qureshi, Chris ChatwinChris Chatwin, Nicolas Huber, Ali Zarafshani, Benjamin Tunstall, Wei Wang
The current source is a key component in bio-impedance measurement systems. The accuracy of the current source can be measured in terms of its output impedance together with other parameters, with certain applications demanding extremely high output impedance. This paper presents an investigation and comparison of different current source designs based on the Enhanced Howland circuit combined with a General Impedance Converter (GIC) circuit using both ideal and non-ideal operational amplifiers. Under differing load conditions two different settings of the GIC are evaluated and the results are compared to show its performance settings. Whilst the study has shown that over a wide bandwidth (i.e. 100Hz-100MHz) the output impedance is limited, operation over a more limited range offers output impedance in the Giga-ohm range, which can be considered as being infinite.

History

Publication status

  • Published

File Version

  • Published version

Journal

Journal of Physics: Conference Series

ISSN

1742-6588

Publisher

IOP Science

Issue

1

Volume

224

Page range

012167

Event name

14th International Conference on Electrical Bioimpedance, Held in Conjunction with the 11th Conference on Biomedical Applications of EIT, ICEBI and EIT 2010;Gainesville

Event location

Gainesville, FL, USA

Event type

conference

Event date

4/4/2012 to 8/4/2012

Department affiliated with

  • Engineering and Design Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2012-08-30

First Open Access (FOA) Date

2016-03-22

First Compliant Deposit (FCD) Date

2016-11-10

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