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

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...

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Bibliographic Details
Published inJournal of semiconductor technology and science Vol. 15; no. 3; pp. 349 - 355
Main Authors Kwon, Kihyun, Kim, Sung-Woo, Bien, Franklin, Kim, Jae Joon
Format Journal Article
LanguageEnglish
Published 대한전자공학회 01.06.2015
Subjects
전기공학
Touchscreen
mutual capacitance
readout circuit
Sensor interface
differential
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ISSN1598-1657
2233-4866
DOI10.5573/JSTS.2015.15.3.349

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Summary: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 μm 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 μA in standby mode. KCI Citation Count: 4
Bibliography:G704-002163.2015.15.3.014
ISSN:1598-1657
2233-4866
DOI:10.5573/JSTS.2015.15.3.349