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A Highly Noise-Immune Capacitive Touch Sensing System Using an Adaptive Chopper Stabilization Method

Title
A Highly Noise-Immune Capacitive Touch Sensing System Using an Adaptive Chopper Stabilization Method
Author
권오경
Keywords
Capacitive touch sensor; touch sensing system; capacitive touch sensor; band-pass filter; chopper-stabilization; noise immunity
Issue Date
2017-02
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE SENSORS JOURNAL, v. 17, no. 3, page. 803-811
Abstract
This paper proposes a capacitive touch sensing system (CTSS) using an adaptive chopper stabilization (ACS) method to achieve high noise immunity. The proposed ACS method quickly detects and adaptively filters out external noises, thereby achieving high noise immunity in the proposed CTSS. To verify the proposed ACS method, a readout integrated circuit (ROIC) was fabricated using a 0.35-mu m CMOS process technology with 18 V high-voltage devices and was measured using a 46-in capacitive touch sensor (CTS). When no external noises are induced into the CTS, the measured signal-to-noise ratio (SNR) of the ROIC is 45.8 dB at a reporting rate of 120 Hz. When external noises are induced into the CTS, the measured SNR of the ROIC using the ACS method is 44.5 dB, which is improved by 22.0 dB compared with the SNR achieved without using the ACS method. Therefore, the proposed ACS method effectively eliminates external noises induced into the CTS of the CTSS.
URI
https://ieeexplore.ieee.org/document/7775075http://repository.hanyang.ac.kr/handle/20.500.11754/112847
ISSN
1530-437X; 1558-1748
DOI
10.1109/JSEN.2016.2636137
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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