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A smart capacitive angle sensor

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3 Author(s)
Sauter, T. ; Res. Unit for Integrated Sensor Syst., Austrian Acad. of Sci., Wiener Neustadt, Austria ; Nachtnebel, H. ; Kero, N.

This paper presents a smart capacitive angle sensor suited for automotive and industrial use. To comply with tough constraints of such applications in terms of environmental conditions, unit costs, and physical size, a fully integrated solution is mandatory. However, the limitations and capabilities of a single mixed-signal integrated circuit have considerable impact not only on the hardware architecture of the digital and analog system components, but also on the feasible measurement algorithm. A thorough investigation of all major nonlinear effects leads to an accurate system-level model of the sensor which is used to design a robust and reliable fully integrated sensor system capable of handling signal offset and amplitude variations. In addition, the proposed system recognizes and reacts on electromagnetic disturbances. Measurements taken from a final prototype comply with the simulation results.

Published in:

Industrial Informatics, IEEE Transactions on  (Volume:1 ,  Issue: 4 )