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Pressure sensor and method of making the same having membranes forming a capacitor

  • US 7,004,034 B2
  • Filed: 09/18/2003
  • Issued: 02/28/2006
  • Est. Priority Date: 04/10/2002
  • Status: Expired due to Term
First Claim
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1. A pressure sensor comprising:

  • a first membrane that flexes in response to pressure;

    a reference cavity covered by said first membrane, said reference cavity containing a vacuum; and

    a second membrane adjacent to said first membrane;

    wherein said second membrane is not in contact with said vacuum; and

    wherein said first and second membranes form a capacitor having a capacitance that varies in accordance with the flexing of said first membrane and said pressure.

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