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Stylus and stylus circuitry for capacitive touch screens

  • US 9,110,523 B2
  • Filed: 09/07/2012
  • Issued: 08/18/2015
  • Est. Priority Date: 09/08/2011
  • Status: Active Grant
First Claim
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1. A circuit for a capacitive touch screen stylus, the circuit comprising:

  • a. a conductive tip for providing capacitive coupling with a capacitive touch screen;

    b. an inverting charge integrator connected to the conductive tip for providing an output signal proportional to a charge induced at the conductive tip;

    c. an inverting amplifier for generating an amplified signal proportional to the signal output from the inverting charge integrator;

    d. a conductive contact for providing electrical or capacitive coupling between the amplified signal and an exterior of the stylus; and

    e. a power supply circuit for powering the inverting charge integrator and the inverting amplifier.

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