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    # LTspice簡易教學 ## 簡介 LTspice是一種免費的SPICE(Simulation Program with Integrated Circuit Emphasis)電子電路模擬軟體,同類的付費軟體包括HSPICE以及PSPICE。在本教學中僅使用LTspice作為示範。 此軟體可以簡單的分析電路,模擬電子元件的反應,並支援圖形化介面以及Spice code方式模擬電路。本課程僅使用圖形化介面,方便學生了解電子元件的狀態。 ## 安裝教學 請至[此網頁](https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html)尋找符合你電腦的系統的主程式下載並安裝。 LTspice支援mac以及Windows,不支援Linux,還請注意這點。 跟著安裝步驟走,同意授權並且安裝(大約5分鐘左右),第一次開啟應該會出現以下畫面(背景就是這麼神奇): ![](https://i.imgur.com/fBmkXkR.jpg) 上圖為Windows安裝成功的畫面,Mac版本會更加簡潔(背景為灰色),功能基本一樣。 至此已經成功安裝LTspice了。 ## 操作指南-以量測定電壓被動元件為例 先開啟一個新的檔案。 ![](https://i.imgur.com/O6vGDC1.png) 在上方工具列中,新增一個電阻到檔案裡。 ![](https://i.imgur.com/Jn15TSO.png) ![](https://i.imgur.com/H2rfEOU.png) 在上方工具列中,尋找Component按鈕,尋找Voltage新增一個電壓源。 ![](https://i.imgur.com/nLIHffw.png) ![](https://i.imgur.com/W64GnWl.png) 至此,已經有兩個元件在工作區中了。 ![](https://i.imgur.com/lVQFWAT.png) 利用Wire工具將兩個元件連接起來。 ![](https://i.imgur.com/Ja46Lnr.png) ![](https://i.imgur.com/jBV8XNP.png) 右鍵電壓源,會跳出選單。將電壓源的電壓設定為10V。 ![](https://i.imgur.com/oLTiFXC.png) ![](https://i.imgur.com/YV8hhBF.png) 右鍵電阻,將電阻設為330Ω。 ![](https://i.imgur.com/2Q31pLy.png) ![](https://i.imgur.com/szIHfTZ.png) 不要忘記新增一個接地線,這樣才能模擬。(一樣在上方工具列中能找到) ![](https://i.imgur.com/HAVjKdi.png) 接著是模擬的部分,點選Simulate,找到Run。第一次模擬的時候會跳出選單詢問模擬參數,如下圖所示。 我們可以設定模擬10秒鐘,0秒開始顯示資料,並且間隔設為0.1秒。 ![](https://i.imgur.com/gRJIIAO.png) ![](https://i.imgur.com/kIYbuJU.png) 設定完成後,會進到模擬中,如下圖所示。.raw檔案顯示的是波形資料,.asc檔案顯示的是你的電路資料。 ![](https://i.imgur.com/56mAqHR.png) 滑鼠移到電阻,會發現游標的圖案改變了。這個時候點一下他,就能看到電流的數據了。 ![](https://i.imgur.com/VnwYqtc.png) ## 練習 (此部分不算成績,僅供練習) 從Component中尋找Transistor(BJT或MOSFET),給不同的電壓並試著量測他的電流變化。 1. 固定$V_{DD}$,調整$V_{GS}$,觀察$I_D$電流。 2. 固定$V_{GS}$,調整$V_{DD}$,觀察$I_D$電流。 ## 小結 本教學帶學生探討LTspice的基本操作,透過量測基本元件的電流熟悉軟體的應用。 同學可以試著去模擬課本上的一些電路來增加對軟體的使用熟悉度。

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