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有源低通濾波器的基本含義要求?

發表時間:2021-02-21 16:00【 閱讀量:-查看手機網址
掃一掃!有源低通濾波器的基本含義要求?掃一掃!

  對濾波器的基本要求是:(1)通帶內信號的衰減要小,阻帶內信號的衰減內要大,由通帶過渡到阻帶的衰減特容性;陡直上升;(2)通帶內的特性阻抗要恒為常數,以便于阻抗匹配。低通濾波器概念有許多不同的形式,其中包括電子線路(如音頻設備中使用的hiss濾波器)、平滑數據的數字算法、音障(acousticbarriers)、圖像模糊處理等等,這兩個工具都通過剔除短期波動、保留長期發展趨勢提供了信號的平滑形式。


  有源低通濾波器顧名思義,就是組成低通濾波器的電路包含有源器件版,而低通濾波權器所起到的作用通俗的講就是通低頻信號阻高頻信號。低通濾波器搭配運放一般來說是為了提升濾波器的阻帶抑制比和通頻帶的信號有效值,進一步提高低通濾波器的品質因數。品質因數是用來描述濾波器分離信號中相鄰頻率成分能力。品質因數q越大,則濾波器的分辨能力越好。


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