A switched-capacitor interface for capacitive pressure sensors |
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Authors: | Yamada M Takebayashi T Notoyama S Watanabe K |
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Affiliation: | Res. Inst. of Electron., Shizuoka Univ., Hamamatsu ; |
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Abstract: | A switched-capacitor interface for a capacitive pressure sensor is developed which provides a linear digital output. It consists basically of a sample/hold circuit followed by a charge-balancing analog-to-digital converter. The sensor capacitance changes hyperbolically with an applied pressure. To convert the nonlinear capacitance change into the linear digital output, two linearization methods are investigated. In either method, a linear digital output with an accuracy higher than 8-b is obtained. Because of its high-accuracy capability and compatible fabrication process, the interface described is best suited for a smart silicon capacitive pressure sensor |
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