×

Capacitive sensor system with improved capacitance measuring sensitivity

  • US 20030016849A1
  • Filed: 04/25/2002
  • Published: 01/23/2003
  • Est. Priority Date: 04/27/2001
  • Status: Active Grant
First Claim
Patent Images

1. A capacitance sensor device comprising:

  • a semiconductor integrated circuit;

    a sensor electrode array arranged in a two dimensional array of n rows and m columns;

    a shield electrode array arranged in a one dimensional array of m columns;

    a quantity of m amplifiers with inputs attached to the charge pump circuit inputs and outputs attached to each shield electrode;

    a quantity of n charge pump circuits;

    a quantity of m blocks of n switches that allows the connection of one of the m sensor electrodes along a column to a charge pump circuit; and

    a quantity of m blocks of 2n switches that allows the connection of the amplifier output to the connection of a shield electrode or to any unused sensor electrodes within the column.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×