IEICE Electronics Express
Online ISSN : 1349-2543
A touch sensor readout circuit using switched- capacitor charge pump
Ho-Young ParkSang-Hyeok YangSuki KimKye-Shin LeeYong-Min Lee
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JOURNALS FREE ACCESS

2012 Volume 9 Issue 13 Pages 1090-1095

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Abstract

This paper presents an on-chip touch sensor readout circuit using charge pump based switched-capacitor scheme. For the proposed touch sensor readout circuit, the touch panel capacitance is directly converted into a voltage level by the switched-capacitor charge pump, which does not require additional signal conditioning for detection. The additional circuitry following the charge pump such as the comparator and flip-flop does not consume any static current. Therefore, the suggested touch sensor can lead to a compact and low power on-chip solution with fast detection time. The prototype circuit is fabricated using CMOS 0.35µm technology, where the consumption current is only 2.2µA.

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© 2012 by The Institute of Electronics, Information and Communication Engineers
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