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國創(chuàng)高通濾波器的原理詳解

  高通濾波器又稱低截止濾波器、低阻濾波器,允許高于某一截頻的頻率通過,而大大衰減較低頻率的一種濾波器。它去掉了信號中不必要的低頻成分或者說去掉了低頻干擾。 其特性在時(shí)域及頻域中可分別用沖激響應(yīng)及頻率響應(yīng)描述。
  
  高通濾波器按照所采用的器件不同進(jìn)行分類的話,會(huì)有源高通濾波器、無源高通濾波器兩類。
  
  無源高通濾波器: 僅由無源元件組成的濾波器,它是利用電容和電感元件的電抗隨頻率的變化而變化的原理構(gòu)成的。
  

  有源高通濾波器:由無源元件和有源器件組成。它主要是利用級聯(lián)的簡單方法很容易構(gòu)成高階濾波器,并且濾波器的體積小、重量輕、不需要磁屏蔽,但在高壓、高頻、大功率的場合不適用。

國創(chuàng)高通濾波器的原理詳解

  
  最簡單的高通濾波器是"一階高通濾波器"(如上圖),它的的特性一般用一階線性微分方程表示,它的左邊與一階低通濾波器完全相同,僅右邊是激勵(lì)源的導(dǎo)數(shù)而不是激勵(lì)源本身。當(dāng)較低的頻率通過該系統(tǒng)時(shí),沒有或幾乎沒有什么輸出,而當(dāng)較高的頻率通過該系統(tǒng)時(shí),將會(huì)受到較小的衰減。實(shí)際上,對于極高的頻率而言,電容器相當(dāng)于“短路”一樣,這些頻率,基本上都可以在電阻兩端獲得輸出。換言之,這個(gè)系統(tǒng)適宜于通過高頻率而對低頻率有較大的阻礙作用,是一個(gè)最簡單的“高通濾波器”。
  
  如果你們還有問題請咨詢029-85251919。國創(chuàng)是一家專業(yè)從事半導(dǎo)體元器件、電源產(chǎn)品研發(fā)與生產(chǎn)的高新技術(shù)企業(yè),目前企業(yè)主營產(chǎn)品有半導(dǎo)體器件、一體化電源、模塊電源等,并且提供專業(yè)的定制及配套服務(wù)!產(chǎn)品廣泛應(yīng)用于航天、航空、兵器、雷達(dá)、通信電臺、船舶、電子裝備等領(lǐng)域,專業(yè)的技術(shù)團(tuán)隊(duì),便捷的一站式配套服務(wù),與您共筑新藍(lán)圖。
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