Application of 4k-order Hadamard matrices to simultaneous driving capacitive touch systems

In recent years, simultaneous driving and sensing techniques for capacitive sensors have used to obtain high signal-to-noise ratio for given time limit of the touch system. In this paper, we show more effective utilization of design constraints of touch system by the use of the variants of 4k-order orthogonal codes. It is also possible to ease the specification of input stages of receivers in capacitive touch controllers.