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Differential capacitive transducer

  • US 5,804,736 A
  • Filed: 01/27/1997
  • Issued: 09/08/1998
  • Est. Priority Date: 06/11/1996
  • Status: Expired due to Term
First Claim
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1. A pressure transducer comprising:

  • a capacitive sensor having first and second variable capacitors for providing a variable capacitance as a function of a differential fluid pressure and a reference capacitor for providing a fixed capacitance independent of the differential fluid pressure, the first and second capacitors each having one fixed plate and one movable plate responsive to differential fluid pressure across the movable plate, the reference capacitor having two fixed plates, the first variable, second variable, and reference capacitors all being located in proximity to one another and in communication with the differential fluid pressure; and

    a switching network connected to the capacitors for selectably connecting at least one of the capacitors to an electronic circuit via the switching network for generating a frequency-based signal whose frequency is a function of the capacitance of the at least one capacitor connected to the electronic circuit through the switching network.

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