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Switched capacitor triple slope capacitance to digital converter
Published in
2006
Volume: 153
   
Issue: 2
Pages: 148 - 152
Abstract
A high accuracy switched capacitor, triple slope digital converter suitable for differential capacitive sensors is presented. The proposed technique accepts differential capacitive sensors possessing either linear or inverse characteristics and provides a linear capacitance to digital conversion. The output is dependent only on a pair of d.c. reference voltages and the clock frequency. Detailed analysis of the proposed scheme establishes that the sensitivity of the scheme to parameter variations is minimal. A prototype implemented and tested for a typical differential capacitive transducer of full-scale ±250pF gave a worst-case error less than 0.05.
About the journal
JournalIEE Proceedings: Circuits, Devices and Systems
ISSN13502409
Open AccessNo
Concepts (8)
  •  related image
    Capacitance
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    Digital devices
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    Electric converters
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    Sensors
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    Transducers
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    DIFFERENTIAL CAPACITIVE SENSORS
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    DIFFERENTIAL CAPACITIVE TRANSDUCER
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    Capacitors