An 89.3% current efficiency, sub 0.1% THD current driver for electrical impedance tomography
Article
Li, J., Jiang, D., Wu, Y, Neshatvar, N., Bayford, R. and Demosthenous, A. 2023. An 89.3% current efficiency, sub 0.1% THD current driver for electrical impedance tomography. IEEE Transactions on Circuits and Systems II: Express Briefs. 70 (10), pp. 3742-3746. https://doi.org/10.1109/TCSII.2023.3294753
Type | Article |
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Title | An 89.3% current efficiency, sub 0.1% THD current driver for electrical impedance tomography |
Authors | Li, J., Jiang, D., Wu, Y, Neshatvar, N., Bayford, R. and Demosthenous, A. |
Abstract | Accurate electrical impedance tomography (EIT) measurements require a current driver with low total harmonic distortion (THD) and high output impedance. Conventional EIT current drivers attain good performance for these parameters but at the expense of low current efficiency. This Brief presents a differential current driver based on a current feedback structure with isolated common-mode feedback, achieving very low THD, high output impedance and high current efficiency. In addition, it uses current DACs to remove any dc offsets at the output nodes. The current driver was fabricated in a 65-nm CMOS technology with 3.3 V supply. Measured results demonstrate a THD of 0.05% and 0.1% at 80 kHz, for 1mAp−p and 1.375mAp−p output current, respectively. The total current consumption is 1.54 mA, resulting in a maximum current efficiency of 89.3%. The measured output impedance is 1.023 MΩ at 500 kHz and 568 kΩ at 1 MHz. |
Keywords | Common-mode feedback; current driver; current feedback; electrical impedance tomography (EIT); high current efficiency; low THD |
Sustainable Development Goals | 7 Affordable and clean energy |
Middlesex University Theme | Sustainability |
Publisher | IEEE |
Journal | IEEE Transactions on Circuits and Systems II: Express Briefs |
ISSN | 1549-7747 |
Electronic | 1558-3791 |
Publication dates | |
Online | 12 Jul 2023 |
01 Oct 2023 | |
Publication process dates | |
Submitted | 13 Jun 2023 |
Accepted | 06 Jul 2023 |
Deposited | 13 Feb 2024 |
Output status | Published |
Accepted author manuscript | License File Access Level Open |
Copyright Statement | For the purpose of open access, the author has applied |
Digital Object Identifier (DOI) | https://doi.org/10.1109/TCSII.2023.3294753 |
Web of Science identifier | WOS:001079708000005 |
Language | English |
https://repository.mdx.ac.uk/item/wyw62
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Accepted author manuscript
An 89.3_ Current Efficiency, Sub 0.1_ THD Current Driver for Electrical Impedance Tomography.pdf | ||
License: CC BY 4.0 | ||
File access level: Open |
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