12.5 2D Coded-aperture-based ultra-compact capacitive touch-screen controller with 40 reconfigurable channels

As mutual-capacitive touch-screens expand their application area to various information devices, better controllers are in demand for larger, thinner, lower-cost touch-screen panels (TSP), and in-cell/on-cell touch displays [1]. In order to gain higher sensitivity from such large and noisy TSPs, numerous parallel analog circuits are integrated on TSP controllers. Many solutions to cope with harsh noise environments, such as continuous-time implementation rather than DT [2] or adding aggressive filtering schemes [3], require sophisticated signal-conditioning circuits to be duplicated on every channel, easily consuming higher analog power and increasing silicon cost.