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CCII-Based Linear Ratiometric Capacitive Sensing by Analog Read-Out Circuits

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Sensors (CNS 2016)

Part of the book series: Lecture Notes in Electrical Engineering ((LNEE,volume 431))

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Abstract

Two electronic interfaces performing a differential (or ratiometric) sensor capacitance to voltage conversion are here presented. The output signal is proportional to the measurand variation x. The two read-out circuits differ themselves in their input stage: the first has an input current-to-voltage conversion, while the second one employs an input voltage source. Both of the solutions utilize commercial second generation current conveyors (CCIIs) as active blocks, in particular AD844. Theoretical analysis, simulated and experimental results have shown a good accuracy. Considering a capacitance variation due to the relative distance change, interface sensitivity (S) and resolution (res) values are constant and satisfactory: for the first solution, S = 8.54 V/μm and res = 674 pm (capacitance resolution value is 89.85 fF, that is −79 dB), while, for the second one, S = 8.13 V/μm and res = 814 pm (capacitance resolution value is 108.5 fF, that is −77 dB).

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Authors and Affiliations

  1. Department of Industrial and Information Engineering and Economics, University of L’Aquila, L’Aquila, Italy

    G. Ferri, F. R. Parente, V. Stornelli & G. Barile

  2. University Campus Bio-Medico di Roma, Rome, Italy

    G. Pennazza & M. Santonico

Authors
  1. G. Ferri
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  2. F. R. Parente
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  3. V. Stornelli
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  4. G. Barile
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  5. G. Pennazza
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  6. M. Santonico
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Corresponding author

Correspondence to G. Ferri .

Editor information

Editors and Affiliations

  1. University of Catania, Catania, Italy

    Bruno Andò

  2. IFAC-CNR, Sesto Fiorentino, Italy

    Francesco Baldini

  3. University of Rome Tor Vergata, Rome, Italy

    Corrado Di Natale

  4. University of Florence, Sesto Fiorentino, Italy

    Giovanna Marrazza

  5. IMM-CNR, Lecce, Italy

    Pietro Siciliano

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Ferri, G., Parente, F.R., Stornelli, V., Barile, G., Pennazza, G., Santonico, M. (2018). CCII-Based Linear Ratiometric Capacitive Sensing by Analog Read-Out Circuits. In: Andò, B., Baldini, F., Di Natale, C., Marrazza, G., Siciliano, P. (eds) Sensors. CNS 2016. Lecture Notes in Electrical Engineering, vol 431. Springer, Cham. https://doi.org/10.1007/978-3-319-55077-0_50

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  • DOI: https://doi.org/10.1007/978-3-319-55077-0_50

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-55076-3

  • Online ISBN: 978-3-319-55077-0

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