A Fully-Differential Correlated Doubling Sampling Readout Circuit for Mutual-capacitance Touch Screens

Citation data:

JSTS:Journal of Semiconductor Technology and Science, ISSN: 1598-1657, Vol: 15, Issue: 3, Page: 349-355

Publication Year:
2015
Citations 6
Citation Indexes 6
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/12043
DOI:
10.5573/jsts.2015.15.3.349
Author(s):
Kwon, Kihyun, Kim, Sung Woo, Bien, Franklin, Kim, Jae Joon
Publisher(s):
The Institute of Electronics Engineers of Korea, IEEK PUBLICATION CENTER
Tags:
Engineering, Materials Science, Sensor interface, readout circuit, Touch screen, differential, mutual capacitance
article description
A fully-differential touch-screen sensing architecture is presented to improve noise immunity and also support most multi-touch events minimizing the number of amplifiers and their silicon area. A correlated double sampling function is incorporated to reduce DC offset and low-frequency noises, and a stabilizer circuit is also embedded to minimize inherent transient fluctuations. A prototype of the proposed readout circuit was fabricated in a 0.18 mm CMOS process and its differential operation in response to various touch events was experimentally verified. With a 3.3 V supply, the current dissipation was 3.4 mA at normal operation and 140 mA in standby mode.

This article has 0 Wikipedia mention.