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本文提出了一种用于大尺寸互电容触摸传感系统的模拟前端IC，通过并行驱动传感器通道解决了传统顺序驱动方案中SNR随通道数增加而下降的问题，实现了240Hz报告率和37dB SNR（针对1mm直径触控笔）。
Sharp, Tenri, Japan 1 2 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] as shown in Fig. 12.3.1. Although the parallel drive mixes up the signals from the multiple channels driven at the same time, the original signals can be reconstructed from the sequence of mixed signals if the drive sequences are linearly independent from each other. By appropriately designing the parallel drive sequences, the SNR is enhanced by √M times compared to that of the sequential drive [1], where M is
Mutsumi Hamaguchi1, Akira Nagao2, Masayuki Miyamoto2
Sharp, Fukuyama, Japan,