A novel readout IC with high noise immunity for charge-based touch screen panels

J. H. Yang, S. C. Jung, Y. J. Woo, J. Y. Jeon, S. W. Lee, C. B. Park, H. S. Kim, S. T. Ryu, G. H. Cho
2010 IEEE Custom Integrated Circuits Conference 2010  
The critical issues in charge-based touch screen panels for large size display are noise and speed. To solve these, this paper introduces a two-point relative sensing based 'Delta-Integration' scheme. It eliminates local noise and increases a readout difference between the touched and non-touched area. As a result, it can replace a high-resolution ADC with a comparator and counter. In addition, the single-bit conversion of Δ-integration method and the proposed wide-bandwidth charge amplifier
more » ... charge amplifier solve a speed issue of a large display. The prototype chip is implemented in a 0.35-µm CMOS technology.
doi:10.1109/cicc.2010.5617378 dblp:conf/cicc/YangJWJLPKRC10 fatcat:ykkatrsmzjejdkr5hm56bdtfqe