SURFACE CAPACITANCE SENSOR SYSTEM USING BURIED STIMULUS ELECTRODE

Title:

SURFACE CAPACITANCE SENSOR SYSTEM USING BURIED STIMULUS ELECTRODE

Document Type and Number:

WIPO Patent Application WO2002095439

Kind Code:

A3

Abstract:

A surface capacitance sensor system is implemented as an array of sensor electrodes (21-23, 31-33, 41-43) near the surface of the integrated circuit and an array of stimulus electrodes below the sensor electrodes. Rows of stimulus electrodes are driven by sources (12, 13) while the voltages at the respective sensor electrodes are measured. Voltage measurements (16) at each sensor electrode allow the surface capacitance at each sensor electrode location to be determined. The capacitance data is used to determine the positions of target electrodes above the array surface as required in the location fingerprint artifacts.

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Inventors:

ANDRADE THOMAS L (US)

Application Number:

PCT/US2002/016533

Publication Date:

May 01, 2003

Filing Date:

May 22, 2002

Export Citation:

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Assignee:

SILABLE INC (US)
ANDRADE THOMAS L (US)

International Classes:

G06K9/00; G01B7/28; (IPC1-7): G01R27/02; G01R27/26

Foreign References:

US5869791A	1999-02-09
US6289114B1	2001-09-11
US6191593B1	2001-02-20
US6317508B1	2001-11-13

Other References: