中原大學電機工程學系
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較簡單的泛用濾波器
指導老師:張俊明   組長:連恆德   組員:陳冠州、李昱賢、 林致遠、張辰宇
一般的通用二階濾波器包含了五種濾波訊號,也就是低通、帶通、高通、帶拒、及全通等五種濾波訊號。使用了傳統一般學者廣泛認為具有最少主動元件的電路結構型式。換言之,三個主動元件可以個別輸出三種不同的基本濾波訊號(即低通、帶通、及高通訊號),而其他的兩種訊號(帶拒及全通訊號)則可以由前述三種濾波訊號的線性組合產生。
然而我們的目標是減少濾波器的三種基本濾波器訊號,我們發現「帶拒」與「帶通」具有以下轉移函數的關係:Iin+(-Ibr)=Ibp。因此,我們可以將基本電路的結構簡化成只使用兩個主動元件的型式。
A conventional universal biquad filter, which consists of five filtering functions, i.e., low-pass, band-pass, high-pass, band-reject, and all-pass, enjoys the least number of active components, namely, three active elements for producing three fundamental (low-pass, band-pass, and high-pass) filtering signals. The other two filtering signals (band-reject and all-pass) can be obtained using the linear combination of the aforementioned three fundamental filtering signals. The following figure shows the structure of a universal biquad filter.
Since the band-reject and band-pass filtering signals have the following relationship: Iin+(-Ibr)=Ibp。Therefore, we can simplify the structure of the basic circuit using only two active components.
我們決定將壓電陶瓷晶片和鞋子做結合。
 
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