公开(公告)号：US10742183B2

公开(公告)日：2020-08-11

申请号：US16229403

申请日：2018-12-21

Applicant: Industrial Technology Research Institute

Inventor： Chien-Wen Chen ,  Chih-Cheng Hsieh ,  You-Shin Chen

IPC: G01D5/38 ,  H03F3/45 ,  H03K17/56 ,  G01D5/34

Abstract: A processing device for position sensing includes a plurality of light sensors, a signal processing unit, a current mirror unit and a transforming unit. The light sensors are spaced apart from each other and sense a light field to generate a plurality of position sensing current signals. The signal processing unit receives the position sensing current signals and provides a load isolation, so as to generate a first current signal and a second current signal. The second current signal is transmitted to a node. The first and second current signals respectively correspond to a first group and a second group of light sensors. The current mirror unit mirrors the first current signal to a third current signal. The third current is transmitted to the node. The transforming unit transforms a differential current signal formed by the second and third current signals on the node to a voltage signal.