An Automatic Ear Detection Technique in Capacitive Sensing Readout IC Using Cascaded Classifiers and Hovering function

We report a capacitance sensing circuit-based ear recognition technique that can lead to an introduction of bezel-less smart phone. The designed chip is fabricated with 130nm technology. The fundamental functionality of pseudo high voltage driving analog front end (AFE) is demonstrated. We also discuss the detection algorithm consisting of weak and strong classifiers. The measurement result showed the feasibility of replacing an existing proximity sensor with detection rate of 83%.