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Method and apparatus for converting capacitance to voltage

  • US 6,356,085 B1
  • Filed: 05/09/2000
  • Issued: 03/12/2002
  • Est. Priority Date: 05/09/2000
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising:

  • a capacitive sensor;

    a voltage supply configured to apply a voltage to said capacitive sensor, thereby producing a sensor output signal; and

    a modulator configured to receive as an input said sensor output signal, wherein said modulator comprises;

    a first integrator configured such that an input of said first integrator is electrically responsive to said sensor output signal;

    a second integrator configured such that an input of said second integrator is electrically responsive to an output of said first integrator;

    a comparator configured such that an input of said comparator is electrically responsive to an output of said second integrator.

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