JP4328861B2 - 能動フィルタ - Google Patents
能動フィルタ Download PDFInfo
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- JP4328861B2 JP4328861B2 JP2005232712A JP2005232712A JP4328861B2 JP 4328861 B2 JP4328861 B2 JP 4328861B2 JP 2005232712 A JP2005232712 A JP 2005232712A JP 2005232712 A JP2005232712 A JP 2005232712A JP 4328861 B2 JP4328861 B2 JP 4328861B2
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Description
LC のみで構成された無損失2 ポート回路の散乱行列を
|b1|2 =|S11|2|a1|2
|b2|2 =|S21|2|a1|2 (3)
となる。
P=|a1|2 −(|b1|2+|b2|2)=0 (4)
であるから、これより
|b1|2=|a1|2−|b2|2 (5)
を得る。
Claims (2)
- 複数の演算増幅器を使用した積分回路を用いて、低域通過特性及びそれと相補な高域通過特性を同時に出力する能動フィルタにおいて、
前記複数の積分回路のそれぞれの前段に、等価積分時定数を大きくあるいは小さくする係数回路を前置して、前記複数の積分回路の内の最終段の積分回路出力を低域通過特性の出力とし、
前記係数回路は、演算増幅器を信号減衰回路として用いて等価積分時定数を大きくし、あるいは信号増幅回路として用いて等価積分時定数を小さくすることで、フィルタの遮断周波数を可変し、かつ、
入力信号と前記複数の積分回路の内の第1の積分回路出力を所定の割合で重みをつけて減算することにより高域通過特性の出力をする能動フィルタ。 - 前記高域通過特性の出力を、低域通過特性の出力に組み合わせて、低域通過の遮断周波数と高域通過の遮断周波数を所定の関係に設定することにより帯域通過特性または帯域除去特性を有する請求項1に記載の能動フィルタ。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005232712A JP4328861B2 (ja) | 2005-08-11 | 2005-08-11 | 能動フィルタ |
Applications Claiming Priority (1)
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---|---|---|---|
JP2005232712A JP4328861B2 (ja) | 2005-08-11 | 2005-08-11 | 能動フィルタ |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007049506A JP2007049506A (ja) | 2007-02-22 |
JP4328861B2 true JP4328861B2 (ja) | 2009-09-09 |
Family
ID=37851964
Family Applications (1)
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JP2005232712A Active JP4328861B2 (ja) | 2005-08-11 | 2005-08-11 | 能動フィルタ |
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JP (1) | JP4328861B2 (ja) |
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2005
- 2005-08-11 JP JP2005232712A patent/JP4328861B2/ja active Active
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JP2007049506A (ja) | 2007-02-22 |
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