REDUCING NOISE SUSCEPTIBILITY IN A MUTUAL CAPACITANCE TOUCHPAD THROUGH AXIS SWAPPING

摘要

A system and method for reducing noise on a touchpad that uses mutual capacitance on an X axis and Y axis grid of transverse electrodes that function as stimulus or drive electrodes on one axis and function as inputs or sense electrodes on a different axis, wherein there is significant noise that can affect operation of the touchpad, and wherein it is desirable to minimize the effects of this noise by simultaneously sampling a group of sense electrodes, wherein by sampling the sense electrodes at the same time, the level of noise on each sense electrode should be similar and can therefore be subtracted out of measured sense signals to therefore more accurately determine a position of a sensed object or objects on the touchpad.