IC693CPU350
IC693CPU350
IC693CPU350
设备的电源和接地供电电压相对于地压波动,但同时二者之间又保持相同的压差,就会形成共模噪声。这种波动仅在接地耦合手指触摸屏幕时才会影响触摸屏的性能。手指的电势与地压相同,手机电源和接地相对其波动,就会导致噪声通过手指注入触摸屏。注入的电荷量主要取决于噪声的峰值对峰值电压。
此外,电荷的传输量还受另外两个因素的显著影响:手指和触摸屏之间的接触面积,以及触摸屏覆盖透镜的厚度。这两个因素的影响可通过平行板电容器的电容方程式来理解:
电容越高,意味着注入触摸屏的噪声就越大。在这种情况下,电容平行板的一侧由手指接触区域形成,另一侧由触摸屏传感器的接收电极形成。
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