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濾波電路

濾波電路. FGen ACH1 +. RC 低通濾波. V in. V o. ACH1 -. 輸出電壓 V o 與輸入電壓 V in 的比值為頻率 ω 的函數 :. 之函數 ,. , Gain 為. ω. RC 高通濾波器. V in. V o. 輸出電壓 V o 與輸入電壓 V in 的比值為頻率 ω 的函數 :. 之函數 ,. , Gain 為. ω. RC 的單位是時間 , 稱時間常數. ㄉ 倒數為角頻率. 除以. 為一般頻率 , 單位為 Hz. 當. 小 Gain 大 , 稱低通濾波 , 可抑制高頻的信號或雜訊 ,.

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濾波電路

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  1. 濾波電路 FGen ACH1+ • RC低通濾波 Vin Vo ACH1- 輸出電壓Vo與輸入電壓Vin的比值為頻率ω的函數:

  2. 之函數, , Gain為 ω

  3. RC高通濾波器 Vin Vo 輸出電壓Vo與輸入電壓Vin的比值為頻率ω的函數:

  4. 之函數, , Gain為 ω

  5. RC的單位是時間, 稱時間常數 ㄉ倒數為角頻率 除以 為一般頻率,單位為Hz 當 小Gain大,稱低通濾波,可抑制高頻的信號或雜訊, 低通濾波ㄉ頻率由時間常數控制 截止頻率是指放大倍率(Gain)降低到 時ㄉ頻率 , 截止頻率由時間常數控制, 也稱截止頻率 為複數,其相位角為 亦即輸出電壓與輸入電壓有一相位差, 且其相位差為頻率ㄉ函數, 截止頻率也為當相位角為-45度時,

  6. 小Gain小,稱高通濾波,可抑制低頻的信號

  7. VR • R • Vin • L • VL RL 濾波 低通濾波 輸出電壓VR與輸入電壓Vin的比值為頻率ω的函數

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