High-power CMOS current driver with accurate transconductance for electrical impedance tomography
Article
Constantinou, L., Triantis, I., Bayford, R. and Demosthenous, A. 2014. High-power CMOS current driver with accurate transconductance for electrical impedance tomography. IEEE Transactions on Biomedical Circuits and Systems. 8 (4), pp. 575-583. https://doi.org/10.1109/TBCAS.2013.2285481
Type | Article |
---|---|
Title | High-power CMOS current driver with accurate transconductance for electrical impedance tomography |
Authors | Constantinou, L., Triantis, I., Bayford, R. and Demosthenous, A. |
Abstract | Current drivers are fundamental circuits in bioimpedance measurements including electrical impedance tomography (EIT). In the case of EIT, the current driver is required to have a large output impedance to guarantee high current accuracy over a wide range of load impedance values. This paper presents an integrated current driver which meets these requirements and is capable of delivering large sinusoidal currents to the load. The current driver employs a differential architecture and negative feedback, the latter allowing the output current to be accurately set by the ratio of the input voltage to a resistor value. The circuit was fabricated in a 0.6-μm high-voltage CMOS process technology and its core occupies a silicon area of 0.64 mm 2 . It operates from a ± 9 V power supply and can deliver output currents up to 5 mA p-p. The accuracy of the maximum output current is within 0.41% up to 500 kHz, reducing to 0.47% at 1 MHz with a total harmonic distortion of 0.69%. The output impedance is 665 kΩ at 100 kHz and 372 kΩ at 500 kHz. |
Research Group | Biophysics and Bioengineering group |
Publisher | IEEE |
Journal | IEEE Transactions on Biomedical Circuits and Systems |
ISSN | 1932-4545 |
Electronic | 1940-9990 |
Publication dates | |
Online | 02 Jan 2014 |
Aug 2014 | |
Publication process dates | |
Deposited | 28 Apr 2015 |
Submitted | 21 Apr 2013 |
Accepted | 30 Sep 2013 |
Output status | Published |
Digital Object Identifier (DOI) | https://doi.org/10.1109/TBCAS.2013.2285481 |
Language | English |
https://repository.mdx.ac.uk/item/852x5
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