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Method and device for processing analogue output signals from capacitive sensors

  • US 7,054,778 B2
  • Filed: 11/30/2001
  • Issued: 05/30/2006
  • Est. Priority Date: 12/01/2000
  • Status: Expired due to Term
First Claim
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1. Method for processing an analogue output signal of a sensor, wherein the analogue sensor output signal comprises a carrier signal having a carrier frequency ω

  • c and being modulated by a measurand detected by the sensor, wherein the method comprises;

    sampling of the analogue sensor output signal using a sampling frequency ω

    A to obtain a sampled sensor output signal having an amplitude which is proportional to the measurand detected by the sensor, wherein the sampling frequency ω

    A of the sampling signal is set to be an integer divisor n of the carrier frequency ω

    c, and wherein the phase of the sampling signal is set so that the sampling signal is synchronous to the carrier signal ω

    c.

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