Abstract-The advances of the semiconductor industry enable microelectromechanical systems sensors, signal conditioning logic and network access to be integrated into a smart sensor node. In this framework, a mixed-mode interface circuit for monolithically integrated gas sensor arrays was developed with high-level design techniques. This interface system includes analog electronics for inspection of up to four sensor arrays and digital logic for smart control and data communication. Although different design methodologies were used in the conception of the complete circuit, high-level synthesis tools and methodologies were crucial in speeding up the whole design cycle, enhancing reusability for future applications and producing a flexible and robust component.Index Terms-Circuit synthesis, gas detector, mixed analog-digital integrated circuit.
It is described in this work a mixed-mode temperature control system for gas sensors. It has been designed to be capable to control different gas sensor structures. The range of temperature and accuracy depends on the gas sensor structure but are usually in the range from Room Temperature up to 600ºC within 1ºC accuracy. The circuit has been designed with 0.8um HV CMOS AMS technology in order to support the 15V biasing voltage that is necessary to reach these high temperatures. A serial peripheral interface communication port allows real time monitoring of the heater resistance. It allows the setting of the parameters of the control and temperature reference also.
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