Eyebrow Corner

 2024年Computex在台灣，今年跟往年最明顯的差異，就是以前都是標榜Intel Inside，現在都是標榜Nvidia Inside，各大Server Vendor都在展示GB200的機櫃，另外就是AI的應用；今年還有特別的科技業護國神物：乖乖，台灣的神秘力量。 Computex was held in Taiwan in 2024. The most obvious difference between this year and previous years is that it used to advertise Intel Inside, but now it advertises Nvidia Inside. All major server vendors are displaying GB200 cabinets and AI applications were shown everywhere. This year there are special technology industry’s protection myth: Guaiguai, AKA Taiwan’s mysterious power.

用ADS存取電感的S2P檔 1. 新建一個工作空間 2. 建立一個電路示意圖 3. 在Parts裡的Basic Components找到TermG以及SP，擺上圖示 4. 再從Data Items內找到S元件，擺上圖示 5. 雙擊SnP圖示，設定port數以及載入SnP檔路徑（這裡代入S2P檔，故設定port number = 2） 6. 點擊上方功能區的走線，將TermG以及SnP圖示連接起來。 7. 雙擊S-PARAMETERS以設定起始頻率、終止頻率及取樣間隔 8. 點擊上方模擬按鍵以進行模擬及偵錯 9. 使用左側Eqn圖示建立下圖的的電感及Q值的方程式 Use ADS to read SnP file 1. Create a new workspace 2. Create a schematic 3. Find TermG and SP in Basic Components from Parts and drag the icon to the blank space 4. Find the S component from Data Items and drag the icon to the proper position 5. Double-click the SnP icon, set the port number and the path to load the SnP file (Here load the S2P file, so set port number = 2) 6. Click on the wiring in the upper functional area to connect the TermG and SnP icons. 7. Double-click S-PARAMETERS to set the start frequency, stop frequency and sampling interval 8. Click the simulation button above to perform simulation and debugging 9. Use the "Eqn" diagram on the left to establish the equations for the ind...

 使用ADS讀取SnP檔案 1. 新建一個工作空間 2. 建立一個電路示意圖 3. 在Parts裡的Basic Components找到TermG以及SP，擺上圖面 4. 再從Data Items內找到S元件，擺上圖面 5. 雙擊SnP圖示，設定port數以及載入SnP檔路徑（這裡代入S2P檔，故設定port number = 2） 6. 點擊上方功能區的走線，將TermG以及SnP圖示連接起來。 7. 雙擊S-PARAMETERS以設定起始頻率、終止頻率及取樣間隔 8. 點擊上方模擬按鍵以進行模擬及偵錯 9. 在新跑出來的視窗中點擊左側的Palette，選取方形圖示，點選S（1,1）, 選擇單位，即可跑出想要看的S（1,1）參數 10. 跑出來的圖形如下： Use ADS to read SnP file 1. Create a new workspace 2. Create a schematic 3. Find TermG and SP in Basic Components from Parts and drag the icon to the blank space 4. Find the S component from Data Items and drag the icon to the proper position 5. Double-click the SnP icon, set the port number and the path to load the SnP file (Here load the S2P file, so set port number = 2) 6. Click on the wiring in the upper functional area to connect the TermG and SnP icons. 7. Double-click S-PARAMETERS to set the start frequency, stop frequency and sampling interval 8. Click the simulation button above to perform simulation and debugging 9. In the newly opened window, ...

Skin effect on signal integrity   As the signal transmission speed becomes higher and higher, the operating frequency becomes higher and higher, and the current tends to flow more and more on the surface. The relationship between the operating frequency and the skin depth is as follows: The following is a comparison table of frequencies and skin depths of copper commonly used in current high-speed products: In terms of PCB design, it is usually necessary to reduce the roughness of the copper surface due to signal integrity considerations. However, if the roughness is too low, the bonding force between copper and P.P. of the PCB will be insufficient, thus affecting its reliability. 趨膚效應對訊號完整性的影響 由於訊號傳輸時速度愈高，操作頻率就愈高，而電流就會愈趨向導體表面流動，其中操作頻率與趨膚深度的關係如下： 以下列舉一些目前高速產品常用的頻率與銅材質趨膚深度的對照表： 以PCB設計而言，通常因為訊號完整性考量需要降低銅表面的粗糙度，但是粗糙度太低也會造成PCB的銅與P.P.結合力不足，進而影響其可靠度。