Patent ID: 8427452

Claim:
A capacitive touchscreen or touch panel system, comprising: a touchscreen comprising a first plurality of electrically conductive drive electrodes configured in rows or columns, and a second plurality of electrically conductive sense electrodes configured in rows or columns arranged at an angle with respect to the rows or columns of the first plurality of electrodes, mutual capacitances existing between the first and second pluralities of electrodes at locations where the first and second pluralities of electrodes intersect, the mutual capacitances changing in the presence of one or more fingers of a user or touch devices brought into proximity thereto; drive circuitry operably connected to the first plurality of drive electrodes; sense circuitry operably connected to the second plurality of sense electrodes and configured to sense input signals therefrom; demodulator circuitry having an input operably connected to the sense circuitry; charge pump circuitry having an output operably connected to the drive circuitry, and clock generator circuitry configured to output a synchronization signal having a clock generator frequency; wherein the charge pump circuitry generates output signals having first distortion signals superimposed thereon, the demodulator input signals have second distortion signals superimposed thereon, the synchronization signal is delivered to the demodulator circuitry through at least first and second integer divider circuits and to the charge pump circuitry through at least the first integer divider circuitry, and the first and second distortion signals have frequencies that are integer divisions of the synchronization frequency.