Header menu link for other important links
X
Switched - capacitor Sigma - delta capacitance to digital converter suitable for differential capacitive sensors
, V. Jagadeesh Kumar
Published in
2007
Abstract
A high accuracy sigma-delta capacitance to digital converter (CDC) that accepts differential capacitive sensors possessing either linear or inverse characteristic and provides a linear digital output is presented here. The sensor capacitances become an integral part of the delta modulator in a sigma-delta digital converter, with the switching sequenced to eliminate the effects of stray capacitances. High accuracy is obtained since the digital output is dictated only by a single dc reference voltage and the transformation constant of the sensor. A prototype built and tested exhibited a worst case error less than 0.15%, establishing the feasibility of the proposed sigma-delta CDC. © 2007 IEEE.
About the journal
JournalConference Record - IEEE Instrumentation and Measurement Technology Conference
ISSN10915281
Open AccessNo
Concepts (9)
  •  related image
    Capacitance
  •  related image
    Digital signal processing
  •  related image
    Electric potential
  •  related image
    Sensors
  •  related image
    Switching systems
  •  related image
    CAPACITANCE TO DIGITAL CONVERTER
  •  related image
    DIFFERENTIAL CAPACITIVE SENSORS
  •  related image
    Switched capacitor circuits
  •  related image
    Delta sigma modulation