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Publication Detail
A Low Power, Low THD Current Driver with Discrete Common-Mode Feedback for EIT Applications
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Publication Type:Conference
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Authors:Li J, Wu Y, Bayford R, Jiang D, Demosthenous A
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Publication date:12/12/2022
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Published proceedings:ICECS 2022 - 29th IEEE International Conference on Electronics, Circuits and Systems, Proceedings
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ISBN-13:9781665488235
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Status:Published
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Name of conference:ICECS 2022 - 29th IEEE International Conference on Electronics, Circuits and Systems
Abstract
A low THD sinusoidal current driver for electrical impedance tomography (EIT) applications is proposed and analyzed in this paper. A discrete common-mode feedback method is proposed to increase the accuracy of the output current amplitude and output impedance. The current driver is designed in 65 nm technology under 3.3 V supply with a chip area of 0.0843 mm2. The maximum output current amplitude is 1.2 mA. In simulations the current driver achieves an average THD of 0.098% at 1 mA output current amplitude and 500 kHz output current frequency. The simulated output impedance is higher than 4 MΩ at a load impedance lower than 3.5 kΩ. The current consumption of the circuit is 1.47 mA and provides a current efficiency of 81.6%.
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