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.
CITATION STYLE
Kwon, K., Kim, S. W., Bien, F., & Kim, J. J. (2015). A fully-differential correlated doubling sampling readout circuit for mutual-capacitance touch screens. Journal of Semiconductor Technology and Science, 15(3), 349–355. https://doi.org/10.5573/JSTS.2015.15.3.349
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