JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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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)
  • Received : 2014.10.27
  • Accepted : 2015.04.10
  • Published : 2015.06.30
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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 $0.18{\mu}m$ 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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References

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