12.3 A 240Hz-reporting-rate 143×81 mutual-capacitance touch-sensing analog front-end IC with 37dB SNR for 1mm-diameter stylus

@article{Hamaguchi2014123A2,
  title={12.3 A 240Hz-reporting-rate 143×81 mutual-capacitance touch-sensing analog front-end IC with 37dB SNR for 1mm-diameter stylus},
  author={Mutsumi Hamaguchi and Akira Nagao and Masayuki Miyamoto},
  journal={2014 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC)},
  year={2014},
  pages={214-215}
}
Realization of a mutual-capacitance touch-sensing system spanning over 30 inches is not a straightforward task, because the SNRs of conventional sequential drive controllers degrade as the number of sensor channels increases. One common way to overcome this drawback is to increase the driving voltage, which however results in an increase in system complexity and cost because it requires high-voltage circuits and devices. This SNR issue is resolved by driving the sensor channels in parallel [1,4… CONTINUE READING

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