Capacitance detecting circuit and detecting method, and...

Details Capacitance detecting circuit and detecting method, and... Capacitance detecting circuit and detecting method, and...

2006-09-05

2006-09-05

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S662000

Reexamination Certificate

active

07102364

ABSTRACT:
A capacitance detecting circuit detects, in terms of voltage, change in capacitance at intersections of a plurality of column lines and a plurality of row lines crossing each other. The capacitance detecting circuit includes a column-line driving unit for driving a column line; a row-line selector for selecting a specific row line from the plurality of row lines; and a capacitance calculator for calculating a capacitance at an intersection of the specific row line and the driven column line based on a reference current that flows in relation to a reference capacitance and a current that flows in relation to the capacitance at the intersection.

REFERENCES:
patent: 5343157 (1994-08-01), Deschamps
patent: 2003/0174871 (2003-09-01), Yoshioka et al.
patent: 0600148 (1993-06-01), None
patent: 0715153 (1996-06-01), None
patent: 11-118415 (1999-04-01), None

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