Capacitive sensor system with improved capacitance measuring sensitivity
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United States of America Patent
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Aug 14, 2007
Grant Date -
Jan 23, 2003
app pub date -
Apr 25, 2002
filing date -
Apr 27, 2001
priority date (Note) -
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Abstract
A capacitance sensor system and method includes a capacitive sensor as an array of sensor electrodes near the surface of the integrated circuit and charge pump circuits for measuring the capacitance at each sensor electrode. Shield electrodes and unused sense electrodes are used for background capacitance cancellation at each array location. The shield electrodes are switched between the circuit supply potentials in a manner synchronous to the capacitance sensing at the sense electrodes. The improved background capacitance cancellation allows all circuitry to be located outside the sensor array. The capacitance data is used to determine the positions of fingerprint artifacts and other fingerprint features.
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