目標:運算放大電路(Op-Amp)頻寬(Bandwidth)之Simscape ......— Electrical Reference2 (dB)...
Transcript of 目標:運算放大電路(Op-Amp)頻寬(Bandwidth)之Simscape ......— Electrical Reference2 (dB)...
![Page 1: 目標:運算放大電路(Op-Amp)頻寬(Bandwidth)之Simscape ......— Electrical Reference2 (dB) f(Hz) 450 835 1550 E 12 RI 0.01 (a) Determine the bandwidth and center frequency](https://reader035.fdocuments.in/reader035/viewer/2022081523/5ffafee5d3486c44c547990b/html5/thumbnails/1.jpg)
目標:運算放大電路(Op-Amp)頻寬(Bandwidth)之 Simscape
Simulation 方俊 航太系
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啟動 MATLAB與 Sumulink
點選 Simscape與 Generic Simscape
點選 Library Browser開啟 Simulink Library Browser視窗如下圖左視窗
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依第一頁題目至 Simulink Library Browser中拉取各元件至左邊工作視窗(先省略參數設定
等細節描述)
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先拉入一組元件即可,完成如下圖
後續三個接地元件可以拷貝方式處理,方法為先壓 Ctrl鍵不放,再將滑鼠游標移至 Electrical
Reference並壓滑鼠左鍵不放並拉至新位置即可拷貝完成
全部元件拷貝完成如下圖
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現將 Op-Amp正負號上下變換位置,方法為先選 Op-Amp,再壓滑鼠右鍵並選 Rotate&Flip、
Flip Block、Up-Down,此法亦可順逆時針旋轉元件、左右更換元件輸出入口與更換元件名稱
位置等。另外,滑鼠右鍵尚有非常多的其他功能。(切記:應善加利用每個軟體所提供的右鍵
功能)
將各元件放置完成如下圖
開始將各元件連線(注意:所有彩色元件與線屬於 Simscape的 PS系統模組,而黑白元件與
線屬於 Simulink的 S系統模組,兩類模組的元件訊號必須以 S→PS與 PS→S元件傳遞)
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連線完成後,可以滑鼠壓元件兩下以開始設其參數值,如更改 Sine Wave的 Frequency (rad/sec)
為 628(即 100 Hz),再選 OK
更改 Capacitor的 Capacitance為 0.01,單位改為 uF,再選 OK
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其次,可以滑鼠直接點選此電容的名稱並將其改為 0.01 uF C1,如此用來確認此電容的參數
已更改完成
Op-Amp為理想運算放大器,因此不需要調整參數,各元件參數與名稱更改完成如下圖(注
意:元件名稱不可相同)
更改 Commonly Used Parameters如下,以節省模擬時間並提升模擬精確度
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所有設定完成後即可點選 Scope與 Run執行模擬與觀察結果
模擬成功後,可點選 Analysis、Control Design、Frequency Response Estimation執行頻率
響應分析
在此視窗中選 Create New、Sinestream
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滑鼠點選 + 並將區間角頻率更改為 6.28 ~ 25,120 rad/s,並計算 60個點,再選 OK、OK
滑鼠點選 Model I/Os、Create New Linearization I/Os
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類似先前範例,先壓滑鼠左鍵不放並框選 S→PS,再選擇下列各項目
再壓滑鼠左鍵不放並框選 PS→S並選擇下列各項目
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點選 Bode即可求解頻率響應
結果如下圖
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可以滑鼠點選最接近曲線頂點的點,再壓滑鼠不放以移動此點至最大值處,如:-0.564 dB之
855 Hz位置即為 Center Frequency,理想值為 835 Hz。再點選左右各一點,並移至相對值少
3dB處,此兩點的頻率區間即為其 Bandwidth,本例為 423 ~ 1680 Hz,理想值為 450 ~ 1550
Hz,
滑鼠壓按繪圖區空白處即可叫出 Property Editor,點掉勾選的 Auto Scale並選 Limits將 x
軸區間更改為 100 ~ 3000 Hz,結果如下圖