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Electronic circuits for capacitive pressure sensors

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4 Author(s)
Patel, A. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Webster, J.G. ; Tompkins, W.J. ; Wertsch, J.J.

Three different electronic circuits for characterizing the commercially available Orthoflex Hercules capacitive pressure sensors over the pressure range of 0-2 MPa are discussed. A portable microprocessor-based system is used to measure the pressure between the foot and the shoe. Two of the circuits, the frequency-to-voltage converter and the phase-locked-loop circuits, have the advantages of simplicity of design and higher bit resolution over counter-type circuits, but they have higher component counts, resulting in greater current consumption and less pressure monitoring time. The counter circuit, though more complex in design, does not have a voltage ripple at the output stage, which compensates for the error due to its poorer bit resolution

Published in:

Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in

Date of Conference:

9-12 Nov 1989

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