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DEVICE AND METHOD FOR READING A CAPACITIVE SENSOR, IN PARTICULAR OF A MICRO-ELECTROMECHANICAL TYPE

  • US 20070152682A1
  • Filed: 11/30/2006
  • Published: 07/05/2007
  • Est. Priority Date: 12/02/2005
  • Status: Active Grant
First Claim
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1. A read device of a capacitive sensor, comprising:

  • a signal source supplying a first electrical read signal for driving said capacitive sensor;

    a modulator stage associated with said signal source and structured to generate a modulated second electrical read signal based on said first electrical read signal and supplying said second electrical read signal to said capacitive sensor;

    a discrete-time sense circuit, connectable to said capacitive sensor, for generating a first electrical output signal, correlated to capacitance variations of said capacitive sensor, in response to variations of said first electrical read signal;

    a demodulator stage , connected to said sense circuit, for demodulating said first electrical output signal and generating a demodulated second electrical output signal; and

    a low-pass filtering stage, connected to said demodulator stage, for generating a filtered third electrical output signal, on the basis of said second electrical output signal.

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