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SpaceMan: Wireless SoC for concurrent potentiometry and amperometry

Ma, D; Chen, Y; Ghoreishizadeh, SS; Georgiou, P; (2021) SpaceMan: Wireless SoC for concurrent potentiometry and amperometry. In: 2021 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE (In press). Green open access

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Abstract

This work describes the implementation of SPACEMan, a wireless electrochemical system with concurrent potentiometric and amperometric sensing that can be utilised for saliva, sweat or point of care diagnostics. This system is designed with the vision of simpler interfaces for biofluid analysis. With a complete system-on-chip including electrochemical sensing, power management and data transmission, conventional interfaces like wirebonds will no longer be required in post-processing steps. The proposed architecture consists of a sensor front-end with four electrodes for concurrent amperometric and potentiometric sensing. This front-end outputs square wave signals mixed together with varying frequencies dependent on the sensed input, with the output type switchable with a state machine. A power management system consisting of a low dropout regulator (LDO) band gap reference (BGR), and a rectifier bridge is utilised for supplying power from an inductive link at 433MHz. Sensor data is transmitted wirelessly to a base station using LSK (Load-Shift Keying). The sensor front-end consumes 18µW, which the power management system more than adequately provides. The core area of the electronics without the coil is a conservative size of 0.41mm 2 .

Type: Proceedings paper
Title: SpaceMan: Wireless SoC for concurrent potentiometry and amperometry
Event: 2021 IEEE International Symposium on Circuits and Systems (ISCAS)
ISBN-13: 9781728192017
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ISCAS51556.2021.9401312
Publisher version: https://doi.org/10.1109/ISCAS51556.2021.9401312
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.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
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
URI: https://discovery.ucl.ac.uk/id/eprint/10131794
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