Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-08-01
2006-08-01
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S679000
Reexamination Certificate
active
07084645
ABSTRACT:
A capacitance detecting circuit includes a code generator for generating code having orthogonality in chronological order. A column-line driver drives the plurality of column lines based on the code by dividing the column lines into a first column line group and a second column line group. A capacitance detector, which is connected to the row line, converts the total of currents generated in capacitances at the intersections with the driven column lines into a voltage signal and outputs the converted voltage signal. A decoding computation unit determines the voltages corresponding to the capacitances at the intersections for each of the column line groups by performing product sum computation between the measured voltages and the code. The column-line driver drives the first column line group and the second column line group by complementary voltages according to the code or information indicating the inversion of the code.
REFERENCES:
patent: 5175802 (1992-12-01), Crookshanks
patent: 5633594 (1997-05-01), Okada
patent: 6462563 (2002-10-01), Kawahara et al.
patent: 19833210 (2000-02-01), None
patent: 0612184 (1994-08-01), None
patent: 0649116 (1995-04-01), None
Saito Junichi
Umeda Yuichi
Alps Electric Co. ,Ltd.
Beyer,Weaver & Thomas LLP.
Nguyen Vincent Q.
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