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A Low-Power Recursive I/Q Signal Generator and Current Driver for Bioimpedance Applications

Hanzaee, Farnaz Fahimi; Neshatvar, Nazanin; Rahal, Mohamad; Jiang, Dai; Bayford, Richard; Demosthenous, Andreas; (2022) A Low-Power Recursive I/Q Signal Generator and Current Driver for Bioimpedance Applications. IEEE Transactions on Circuits and Systems II: Express Briefs 10.1109/TCSII.2022.3187076. (In press). Green open access

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Abstract

This brief presents a power-efficient quadrature signal generator and current driver application-specific integrated circuit (ASIC) for bioimpedance measurements in an electrical impedance tomography system for monitoring lung function. The signal generator is realized by a digital recursive signal oscillator with the ability of generating quadrature signals over a wide frequency range. The generated in-phase signal is applied to a current driver. It uses a balanced current-mode feedback architecture that monitors the output current through a feedback loop to minimize common-mode voltage build-up at the injection site. The quadrature signals can be used for I/Q demodulation of the measured bioimpedance. The ASIC was designed in TSMC 65 nm technology occupying an area of 0.21 mm2. The current driver can generate up to 0.7 mAp-p current up to 200 kHz and consumes 2.7 mW power using ±0.8 V supplies.

Type: Article
Title: A Low-Power Recursive I/Q Signal Generator and Current Driver for Bioimpedance Applications
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TCSII.2022.3187076
Publisher version: https://doi.org/10.1109/TCSII.2022.3187076
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: ASIC, bioimpedance, current driver, FIR filter, low power, quadrature recursive signal oscillator
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10152257
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