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A frequency-based signature gas identification circuit for SnO2 gas sensors

Authors Ng, Kwan Ting
Boussaid, Farid
Bermak, Amine View this author's profile
Issue Date 2010
Source ISCAS 2010 - 2010 IEEE International Symposium on Circuits and Systems: Nano-Bio Circuit Fabrics and Systems , 2010, p. 2275-2278
Summary This paper presents a gas identification circuit for tin oxide (SnO 2) gas sensors. The proposed circuit uses 2 gas sensors with different characteristics to achieve gas identification. A spike train is generated during operation, with the frequency of spike occurrence being gas dependent but concentration invariant. As a result, the spike firing frequency can be used to achieve gas identification. The calibration of this readout technique requires only a single exposure to the target gases to extract the sensor resistances. The low complexity processing is suitable for on-chip implementation. The functionality of this circuit has been validated with real data from our in-house fabricated sensors. ©2010 IEEE.
ISSN 0271-4302
ISBN 978-1-4244-5309-2
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Language English
Format Conference paper
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