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System-level design of a readout circuit with thermostatic control for a MEMS pellistor sensor

: Leman, O.; Srivastava, M.; Hauer, J.


Benoit, Charlot; Mita, Yoshio; Nouet, Pascal; Pressecq, Francis; Schröpfer, Gerold; Rencz, Marta; Schneider, Peter ; Institute of Electrical and Electronics Engineers -IEEE-; IEEE Components, Packaging, and Manufacturing Technology Society:
DTIP 2015, 17th Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS : 27 - 30 April 2015, Montpellier, France
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-8627-9
ISBN: 978-1-4799-8545-6
ISBN: 978-1-4799-8625-5
Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS <17, 2015, Montpellier>
Fraunhofer IIS ()

Catalytic flammable gas sensors detect the presence of flammable gasses in air at a non-dangerous concentration level, thus helping in the prevention of explosion risks. These devices are usually operated without thermal control i.e. they measure the temperature increase of a detector induced by the catalytic combustion of the flammable gas. We propose the system-level design of a bias and readout system that directly measures the heat produced by the catalytic combustion. The proposed solution operates the sensor at a constant temperature via a feedback scheme that contains two thermal feedback loops. We chose a feedback control that uses pulse-density modulation, thus the proposed system implements a direct analog-to-digital conversion of the heat produced by the catalytic combustion. In practice, this mixed-signal front-end for pellistors is expected to extend the functionality and precision of the sensor while providing with a simple implementation.