Li, Jiayang;
Jiang, Dai;
Wu, Yu;
Neshatvar, Nazanin;
Bayford, Richard;
Demosthenous, Andreas;
(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
10.1109/tcsii.2023.3294753.
(In press).
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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 1 mAp-p and 1.375 mAp-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.
| Type: | Article |
|---|---|
| Title: | An 89.3% Current Efficiency, Sub 0.1% THD Current Driver for Electrical Impedance Tomography |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/tcsii.2023.3294753 |
| Publisher version: | https://doi.org/10.1109/tcsii.2023.3294753 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Common-mode feedback, current driver, current feedback, electrical impedance tomography (EIT), high current efficiency, low THD |
| 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/10173414 |
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