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

Langlois, PJ; Wu, Y; Bayford, RH; Demosthenous, A; (2015) On the application of frequency selective common mode feedback for multifrequency EIT. Physiological Measurement , 36 (6) pp. 1337-1350. 10.1088/0967-3334/36/6/1337. Green open access

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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 62 dB for current feedback and 31 dB for voltage feedback. Frequencies ranged from 50 kHz to 1 MHz.

Type: Article
Title: On the application of frequency selective common mode feedback for multifrequency EIT
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0967-3334/36/6/1337
Publisher version: http://dx.doi.org/10.1088/0967-3334/36/6/1337
Language: English
Additional information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: Science & Technology, Life Sciences & Biomedicine, Technology, Biophysics, Engineering, Biomedical, Physiology, Engineering, bioimpedance, common mode error, common mode feedback, current drive, imbalance, multifrequency, ELECTRICAL-IMPEDANCE TOMOGRAPHY, CHOPPER STABILIZATION, INSTRUMENTATION, CIRCUIT, DESIGN
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1483227
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