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什么是高通濾波器的電感和電容?

發表時間:2021-04-01 18:04【 閱讀量:-查看手機網址
掃一掃!什么是高通濾波器的電感和電容?掃一掃!

顧名思義,高通濾波器就是一個運放IC外加由幾個元件組成的外圍電路,阻止低于“一定數版值”的權低頻段信號通過,但允許“一定數值”以上的高頻段信號通過。(低通濾波器只是恰好相反,通低阻高),還有帶通(只允許一定范圍的頻段信號通過,超出阻止),帶阻(只阻止一定范圍的頻段信號通過,超出允許)之類。


對于電感,是由螺旋導線制成,對于直流信號來講,只要是導線就能導通,但版是對于高頻信號來講,由權于信號的傳輸是由空間的電場、磁場的交變進行傳輸。電感對于交變的電場會產生磁場,這個磁場阻礙了信號的交變磁場變化強度,從而阻礙了高頻信號的傳輸。從仿真的角度來看,電感通直流阻高頻,因此等效為一個低通濾波器。


對于電容來講,對于直流信號時斷路,而對于高頻信號,由于高頻信號的電場在方向上會發生翻轉,從而信號可以“繞過”電容而進行傳輸。你的教材上的公式f=1/(2pai*RC)可能有點問題。應該是f=1/sqrt(LC)。這個公式描述的是諧振器,電容的電場儲能與電感的磁場儲能進行交換產生諧振。

重生九零小辣椒
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