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Title: A frequency-based signature gas identification circuit for SnO2 gas sensors
Authors: Ng, Kwan Ting
Boussaid, Farid
Bermak, Amine
Keywords: Gas sensors
Tin oxide
Spike firing frequency
Issue Date: May-2010
Citation: Proceedings of 2010 IEEE International Symposium on Circuits and Systems, ISCAS 2010, 30 May-2 June 2010, Paris, France, p. 2275-2278.
Abstract: This paper presents a gas identification circuit for tin oxide (SnO2) 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.
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