ToDestination

1.How does averaging increase the Signal to Noise ratio?
http://dsp.stackexchange.com/questions/19159/how-does-averaging-increase-the-signal-to-noise-ratio

2.Dithering/Averaging - To increase the resolution
http://dsp.stackexchange.com/questions/19782/improving-digitization-by-adding-white-noise-before-oversampling/19783#19783
http://www.analog.com/media/en/training-seminars/tutorials/MT-004.pdf

3.PRS clock source vs. fixed frequency clock

4.Why oversampling can reduce the system noise?

5.Ground loop basics
http://www.epanorama.net/documents/groundloop/basics.html#

6.How to understand "Hysteresis"?

7.What's the difference between functional requirements and performance requirements for the tt system?
Functional requirements:pass/fail. Performance requirements:numerical.

8.Edge and Core
The edge is the active area at the perimeter of the touch panel. The width of this area is 3.5mm and is independant of touch object size. The core is the active area bounded by the edge. [001-65293]

9.電容并聯的作用

同種類型的電容并聯作用主要是擴容。
不同種類型的電容并聯一般是一個感性強、一個感性弱。

小容量電容高頻信號易通過，大容量電容低頻信號易通過。

大電容在低頻時能提供好的通路，而在高頻時由于其寄生電感的存在阻抗將變大而無法提供濾波通路，所以大電容不能濾高頻，而小電容在低頻時阻抗太大而無法提供濾波通路，所以不能共同一電容濾高頻和低頻。

電容并聯的好處在于增大容值，減小容抗。
并聯數量越多，效果越明顯，不過成本就越高。

電解是用來濾低頻，陶瓷是用來濾高頻的。此外，電解有漏電電流，所以后面在接陶瓷來消除漏電流的。

在開關電源中，兩個電容并聯的作用為電容大的那個是用來濾波的，小的那個電容是用來消除大的電容在高頻時產生的感性特性的！