Schormans, M;
Valente, V;
Demosthenous, A;
(2018)
A Low-Power, Wireless, Capacitive Sensing Frontend Based on a Self-Oscillating Inductive Link.
IEEE Transactions on Circuits and Systems I: Regular Papers
, 65
(9)
pp. 2645-2656.
10.1109/TCSI.2018.2835148.
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Abstract
Wireless sensing systems are becoming popular in a range of applications, particularly in the case of biomedical circuits and food monitoring systems. A typical wireless sensing system, however, may require considerable complexity to perform the necessary analog to digital conversion and subsequent wireless transmission. Alternatively, in the case of inductive link based systems, large, manually operated impedance analyzers are required. Based on a detailed analysis of the link impedance, this paper proposes a simple method for wireless capacitive sensing through an inductive link that uses a self-oscillator and a frequency counter. The method enables changes in capacitance to be sensed and wirelessly transmitted simultaneously. In order to test the effectiveness of the method, a self-oscillating circuit was designed and fabricated in 0.18 μm CMOS, and combined with an on-chip humidity sensing capacitor. The system was tested in a humidity chamber across a range of 20-90%rh. Measured results from the system demonstrate that capacitive changes as small as 28 fF, translating to <2%rh, can be resolved, with a power consumption of 1.44 mW.
| Type: | Article |
|---|---|
| Title: | A Low-Power, Wireless, Capacitive Sensing Frontend Based on a Self-Oscillating Inductive Link |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TCSI.2018.2835148 |
| Publisher version: | https://doi.org/10.1109/TCSI.2018.2835148 |
| Language: | English |
| Additional information: | © 2018 IEEE. This work is licensed under a Creative Commons Attribution 3.0 License (https://creativecommons.org/licenses/by/3.0/). |
| Keywords: | Sensors, Resonant frequency, Wireless sensor networks, Wireless communication, Impedance, Capacitance, Monitoring |
| 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/10053473 |
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