Li, Jiayang;
Jiang, Dai;
Demosthenous, Andreas;
(2025)
Design and Optimization of a High Linearity On-Chip Sinusoidal Current Generator for Bioimpedance Measurements Using Direct Digital Synthesis.
IEEE Transactions on Circuits and Systems I: Regular Papers
10.1109/tcsi.2025.3561734.
(In press).
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Abstract
This paper presents an optimization methodology to enhance the linearity of direct digital synthesis (DDS)-based on-chip sinusoidal current generators (SCGs) for bioimpedance measurements. After a detailed analysis of the origin of harmonics and their impact on measurement accuracy in conventional DDS-based SCGs, three different harmonic cancellation schemes are proposed. These are designed to decrease the harmonics in various applications with differing hardware requirements, significantly improving the precision and efficiency of DDS-based SCGs. The approach was implemented in a DDS-based SCG in 65 nm CMOS technology. Both simulations and measurements demonstrate a marked improvement in linearity with a figure-of-merit at least 9.4 times better than prior work. Although tailored for bioimpedance applications, the approach is also suitable for other low power, high linearity sinusoidal signal generators.
| Type: | Article |
|---|---|
| Title: | Design and Optimization of a High Linearity On-Chip Sinusoidal Current Generator for Bioimpedance Measurements Using Direct Digital Synthesis |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/tcsi.2025.3561734 |
| Publisher version: | https://doi.org/10.1109/tcsi.2025.3561734 |
| 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: | Bioimpedance, direct digital synthesis, sinusoidal current generator, harmonic cancellation, total harmonic distortion |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS 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/10208788 |
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