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本文提出了一种1mm间距80×80通道的触摸传感器，通过两步双模电容扫描（自电容和互电容分层测量）大幅缩短高分辨率下的扫描时间，实现了322Hz的帧率。同时采用160个专用行/列ADC并行读出，并使用时域数字转换（基于计数器的斜率ADC）降低功耗和面积。
322Hz-frame-rate touch sensor is reported. Multiple touch points are detected by a two-step dual-mode capacitance scan, where self- and mutual-capacitance measurements are hierarchically performed in two steps to reduce scan time that is otherwise increased due to high resolution. 160 dedicated row and column ADCs are used for the parallel read-out to further reduce scan time. A time-domain digital conversion that uses a counter-based slope ADC significantly reduces power and area for the parallel ADC approach. The signal attenuation due to the sensor capacitance reduction in the 1mm fine-pitch electrode is compensated by using thorough noise-reduction techniques in the sensor analog front-end (AFE). A 0.35μm CMOS prototype demonstrates 41dB SNR with >3× higher pitch resolution, >10× faster
Noriyuki Miura1, Shiro Dosho2, Satoshi Takaya1, Daisuke Fujimoto1,
Takumi Kiriyama1, Hiroyuki Tezuka2, Takuji Miki2, Hiroto Yanagawa2, Makoto Nagata1 Kobe University, Kobe, Japan, 2Panasonic, Osaka, Japan 1 A 1mm-pitch 80×80-channel