A low-power fast readout circuit using a dual-mode sensing algorithm for medium-size capacitive touch screen panels

Hyeon June Kim; Dong Shin Jo; Jun Hyeok Yang; Seung Tak Ryu

doi:10.1002/j.2168-0159.2014.tb00141.x

A low-power fast readout circuit using a dual-mode sensing algorithm for medium-size capacitive touch screen panels

Hyeon June Kim
, Dong Shin Jo
, Jun Hyeok Yang
, Seung Tak Ryu

Dept. of Semiconductor Engineering

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A new readout circuit architecture for capacitive touch screen panels (TSPs) is introduced to enhance the reporting rate and to improve the signal to noise ratio (SNR) with low power consumption. The proposed Dual-Mode Sensing (DMS) method finds the actual touch spots without feedback from the TSP to the MCU. In addition, the effect of noise coupled to the touch signal is reduced owing to the averaging effect of the proposed continuous-time integration (CTI) technique. The circuit was designed for a 0.35 μm CMOS technology. The proposed sensing scheme shows a 257 Hz reporting rate under a simultaneous 10 touch condition on a 10.1 inch TSP, providing a 33 dB SNR with power consumption of 679 μW from a 3.3V supply.

Original language	English
Pages (from-to)	540-543
Number of pages	4
Journal	Digest of Technical Papers - SID International Symposium
Volume	45
Issue number	1
DOIs	https://doi.org/10.1002/j.2168-0159.2014.tb00141.x
State	Published - Jun 2014

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title = "A low-power fast readout circuit using a dual-mode sensing algorithm for medium-size capacitive touch screen panels",

abstract = "A new readout circuit architecture for capacitive touch screen panels (TSPs) is introduced to enhance the reporting rate and to improve the signal to noise ratio (SNR) with low power consumption. The proposed Dual-Mode Sensing (DMS) method finds the actual touch spots without feedback from the TSP to the MCU. In addition, the effect of noise coupled to the touch signal is reduced owing to the averaging effect of the proposed continuous-time integration (CTI) technique. The circuit was designed for a 0.35 μm CMOS technology. The proposed sensing scheme shows a 257 Hz reporting rate under a simultaneous 10 touch condition on a 10.1 inch TSP, providing a 33 dB SNR with power consumption of 679 μW from a 3.3V supply.",

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AB - A new readout circuit architecture for capacitive touch screen panels (TSPs) is introduced to enhance the reporting rate and to improve the signal to noise ratio (SNR) with low power consumption. The proposed Dual-Mode Sensing (DMS) method finds the actual touch spots without feedback from the TSP to the MCU. In addition, the effect of noise coupled to the touch signal is reduced owing to the averaging effect of the proposed continuous-time integration (CTI) technique. The circuit was designed for a 0.35 μm CMOS technology. The proposed sensing scheme shows a 257 Hz reporting rate under a simultaneous 10 touch condition on a 10.1 inch TSP, providing a 33 dB SNR with power consumption of 679 μW from a 3.3V supply.

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A low-power fast readout circuit using a dual-mode sensing algorithm for medium-size capacitive touch screen panels

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