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Capacitance-to-voltage transformation circuit

  • US 4,149,231 A
  • Filed: 05/04/1977
  • Issued: 04/10/1979
  • Est. Priority Date: 05/04/1977
  • Status: Expired due to Term
First Claim
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1. A capacitance-to-voltage transformation circuit for providing an output voltage variation related to capacitance variations in a variable capacitor element, comprising:

  • means for applying a reference voltage potential;

    circuit means coupled to said applying means for charging said variable capacitor element to said reference potential;

    switching means for cyclically connecting said variable capacitor element to said circuit means and to a ground potential; and

    impedance means coupled between said circuit means and said switching means for conducting the charging current provided by said circuit means to said variable capacitor during a predetermined portion of each of said switching cycles and for developing an output voltage variation related to the variations in capacitance of said variable capacitor.

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