JSTS:Journal of Semiconductor Technology and Science

  • 제15권3호
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  • Pages.349-355
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  • 2015
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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A Fully-Differential Correlated Doubling Sampling Readout Circuit for Mutual-capacitance Touch Screens

  • Kwon, Kihyun (school of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Sung-Woo (school of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Bien, Franklin (school of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Jae Joon (school of electrical and computer engineering, Ulsan National Institute of Science and Technology)
  • 투고 : 2014.10.27
  • 심사 : 2015.04.10
  • 발행 : 2015.06.30
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초록

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 $0.18{\mu}m$ 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 $140{\mu}A$ in standby mode.

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참고문헌

  1. Y. Hu, et al., "3D gesture-sensing system for interactive displays based on extended-range capacitive sensing," IEEE Int. Solid-State Circuits Conf. Dig. Tech. Papers, pp. 212-213, Feb., 2014.
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