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).
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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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