On the application of frequency selective common mode feedback for multifrequency EIT

Langlois, Peter J. and Wu, Yu and Bayford, Richard and Demosthenous, Andreas (2015) On the application of frequency selective common mode feedback for multifrequency EIT. Physiological Measurement, 36 (6). pp. 1337-1350. ISSN 0967-3334

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Abstract

Common mode voltages are frequently a problem in electrical impedance tomography (EIT) and other bioimpedance applications. To reduce their amplitude common mode feedback is employed. Formalised analyses of both current and voltage feedback is presented in this paper for current drives. Common mode effects due to imbalances caused by the current drives, the electrode connections to the body load and the introduction of the body impedance to ground are considered. Frequency selective narrowband common mode feedback previously proposed to provide feedback stability is examined. As a step towards multifrequency applications the use of narrowband feedback is experimentally demonstrated for two simultaneous current drives. Measured results using standard available components show a reduction of 62dB for current feedback and 31dB for voltage feedback. Frequencies ranged from 50 kHz to 1 MHz.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 15812
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Depositing User: Richard Bayford
Date Deposited: 07 May 2015 14:40
Last Modified: 07 Dec 2018 08:30
URI: http://eprints.mdx.ac.uk/id/eprint/15812

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