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Author

Kim, Jae Joon
Convergence Semiconductor Design Lab (CSDL)
Research Interests
  • CMOS IC design, sensors , IoT , health care, wearable, ECU , mmWave & Terahertz wireless

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

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Title
A Fully-Differential Correlated Doubling Sampling Readout Circuit for Mutual-capacitance Touch Screens
Author
Kwon, KihyunKim, Sung WooBien, FranklinKim, Jae Joon
Keywords
Sensor interface, readout circuit, Touch screen, differential, mutual capacitance
Issue Date
201506
Publisher
IEEK PUBLICATION CENTER
Citation
JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, v.15, no.3, pp.349 - 355
Abstract
—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.
URI
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DOI
http://dx.doi.org/10.5573/JSTS.2015.15.3.349
ISSN
1598-1657
Appears in Collections:
ECE_Journal Papers

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