A fully-differential capacitive touch controller with input common-mode feedback for symmetric display noise cancellation

A fully-differential capacitive touch sensing method is proposed in which common-mode noise currents are symmetrically subtracted at the differential input of the first stage such that it doesn't contribute to dynamic range reduction in the later stages. And, for better sensitivity, the propose...

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Bibliographic Details
Published in2014 Symposium on VLSI Circuits Digest of Technical Papers pp. 1 - 2
Main Authors Ki-Duk Kim, Sanghyub Kang, Yoon-Kyung Choi, Kyung-Hoon Lee, Choong-Hoon Lee, Jin-chul Lee, Choi, Michael, Kyungjun Ko, Joonwoo Jung, Namgu Park, Hojin Park, Gyoo-Cheol Hwang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2014
Subjects
Capacitance
Frequency-domain analysis
Noise
Noise measurement
Sensitivity
Sensors
Voltage control
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Summary:A fully-differential capacitive touch sensing method is proposed in which common-mode noise currents are symmetrically subtracted at the differential input of the first stage such that it doesn't contribute to dynamic range reduction in the later stages. And, for better sensitivity, the proposed method could accumulate signal charges in continuous time domain, and does not suffer from aliasing issues observed in many discrete-time charge integrating methods. Measurement results showed 42 dB SNR for a 1-mm diameter stylus on a 5-inch full-HD on-cell touch display panel.
ISBN:9781479933273
1479933279
ISSN:2158-5601
2158-5636
DOI:10.1109/VLSIC.2014.6858444