DESIGN OF A POWER CONTROL UNIT DEDICATED TO GAS SENSORS BASED ON MICROHOTPLATE PLATFORM

F. Parret Philippe Menini 1 M. Guerrero A. Martinez
1 LAAS-MICA - Équipe MICrosystèmes d'Analyse
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : This paper deals with time drift problems of polysilicon resistors used as heater in gas sensors. Actually, this polysilicon heater is applied by a constant voltage, so its time drift about 20% of nominal value implies an equivalent variation of operating temperature. Then, this study presents a new design of power-control unit dedicated to force the same power on the heater resistor independently of its value and its time drift. Elaborated with two current mirrors, a multiplier and a proportional regulation system, this non optimized prototype allows good temperature stabilization with an error which doesn't exceed 3°C in the worst case.
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F. Parret, Philippe Menini, M. Guerrero, A. Martinez. DESIGN OF A POWER CONTROL UNIT DEDICATED TO GAS SENSORS BASED ON MICROHOTPLATE PLATFORM. 10th International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES'03), Jun 2003, Lodz, Poland. pp.198. ⟨hal-02160599⟩

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