Li, M;
Vanhoestenberghe, A;
Ghoreishizadeh, SS;
(2022)
An integrated circuit to enable electrodeposition and amperometric readout of sensing electrodes.
In:
Proceedings of the 2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS).
IEEE: Puerto Varas, Chile.
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Abstract
This paper presents the design of an integrated circuit (IC) for (i) electrochemical deposition of sensor layers on the on-chip pad openings to form sensing electrodes, and (ii) amperometric readout of electrochemical sensors. The IC consists of two main circuit blocks: a Beta-multiplier based current reference for galvanostatic electrodeposition, and a switch-capacitor based amperometric readout circuit. The circuits are designed and simulated in a 180-nm CMOS process. The reference circuit generates a stable current of 99 nA with a temperature coefficient of 141 ppm/°C at best and 170 ppm/°C on average (across corners) over a supply voltage range of 1.2-2.4 V, and a line regulation of 0.7 %/V. The readout circuit measures current within pm 2 mu mathrmA with 99.9% linearity and a minimum integrated input-referred noise of 0.88 pA.
| Type: | Proceedings paper |
|---|---|
| Title: | An integrated circuit to enable electrodeposition and amperometric readout of sensing electrodes |
| Event: | 2022 IEEE 13th Latin America Symposium on Circuits and System (LASCAS) |
| Dates: | 1 Mar 2022 - 4 Mar 2022 |
| ISBN-13: | 978-1-6654-2008-2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/LASCAS53948.2022.9789069 |
| Publisher version: | https://doi.org/10.1109/LASCAS53948.2022.9789069 |
| 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: | current reference, subthreshold region, sensor fabrication, potentiostat, switch capacitor |
| 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 Med Phys and Biomedical Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL 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/10152570 |
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