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Title: A Bio-Impedance Readout IC with Frequency Sweeping from 1k-to-1MHz for Electrical Impedance Tomography
Authors: Hyunsoo, Ha
Konijnenburg, Mario
Lukita, Budi
Van Wegberg, Roland
Xu, Jiawei
Van Den Hoven, Richard
LEMMENS, Marijn 
THOELEN, Ronald 
Van Hoof, Chris
Van Helleputte, Nick
Issue Date: 2017
Publisher: IEEE Xplore
Source: 2017 Symposium on VLSI Circuits Digest of Technical Papers, IEEE Xplore,p. C174-C175
Abstract: This paper presents a bio-impedance (BIOZ) readout IC for electrical impedance tomography (EIT). The IC includes a complete readout channel for impedance characterization at various frequencies ranging from 1k-to-1MHz, an input multiplexer and a programmable digital controller enabling multi-frequency impedance scanning from multiple locations. To relax the bandwidth requirements of the readout channel, pre-demodulation before the IA is employed. A fast channel settling mechanism (<1ms) allows quick switching between frequencies enabling a fast imaging speed. Dynamic element matching (DEM) in the current generation and chopping in the readout front-end are adopted to mitigate 1/f noise resulting in a noise floor of 38.4mRMS. This IC, fabricated in 0.18m, consumes 18.7W and 63W in the readout front-end and the current generator (CG), respectively. By means of in-vitro and in-vivo testing its effectivity for EIT is demonstrated.
Keywords: frequency measurement; tomography; integrated circuits; impedance; frequency modulation; electrodes
Document URI:
ISBN: 9784863486065
DOI: 10.23919/VLSIC.2017.8008471
ISI #: 000428759000069
Rights: Copyright© 2017 by the Japan Society of Applied Physics. All rights reserved.
Category: C1
Type: Proceedings Paper
Validations: ecoom 2019
Appears in Collections:Research publications

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