6.6 A 240Hz-reporting-rate mutual-capacitance touch-sensing analog front-end enabling multiple active/passive styluses with 41dB/32dB SNR for 0.5mm diameter

Abstract

A mutual-capacitance touch-sensing architecture and a system that enables concurrent usage of multiple active styluses having different properties such as color, thickness, shape, etc., are developed and verified with use of an existing touch controller [1]. An extension of the architecture to handle wireless active styluses is also developed and verified with an analog front-end (AFE) IC.