Capacitive touch-pad devices with dynamic bias

Details Capacitive touch-pad devices with dynamic bias Capacitive touch-pad devices with dynamic bias

H - Electricity

01

G

340/124.2

H01G 5/04 (2006.01) H03K 3/26 (2006.01)

Patent

CA 1117618

RD-9455 ABSTRACT OF THE DISCLOSURE A dynamic biasing capacitance is formed between a trans- mitting electrode and a receiving electrode of a capacitive touch- pad device to couple a portion of the scan voltage signal into the sense node of a voltage comparator circuit, coupled to the receiving electrode, to offset the comparator circuit threshold voltage. The dynamic biasing capacitance may be formed by overlapping portion of the electrode, with a dielectric layer positioned therebetween, or by the parasitic capacitance between sligned and surfaces of the two electrodes, with the magnitude of the dynamic biasing capacitance being adjusted by variation of interelectrode geometries.

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