巴特沃斯低通濾波器計算器 | LC低通濾波器計算器 | Pi型濾波器參數計算

巴特沃斯濾波器是電子濾波器的一種,它的特點是通頻帶內的頻率響應曲線最大限度平坦,沒有起伏,而在阻頻帶則逐漸下降為零。在振幅的對數對角頻率的波特圖上,從某一邊界角頻率開始,振幅隨著角頻率的增加而逐步減少,趨向負無窮大。

而低通濾波器有很多種,最通用的就是 巴特沃斯濾波器 和 切比雪夫濾波器 。

輸入數值
 
Cutoff Frequency:
Impedance Z0:
Number of Components: (1-11)
 
 
計算結果
Inductance: Capacitance:
Unit : Unit :
L1: C1:
L2: C2:
L3: C3:
L4: C4:
L5: C5:
  C6:
The Butterworth type filter was first described by the British engineer Stephen Butterworth.

A PI filter is a filter that has a series element and two parallel elements connected in the shape of the Greek letter PI.

Butterworth filter are characterized by a constant gain (flat response) across the midband of the circuit and a 20 dB per decade roll-off rate for each pole contained in the circuit.

Butterworth filters are termed maximally flat magnitude response filters, optimized for gain flatness in the pass band. The attenuation is -3db at cutoff frequency. Above the cutoff frequency the attenuation is -20 db.

The Butterworth is the only filter that maintains same shape for higher orders whereas other varieties of filters (Bessel, Chebyshev, elliptic) have different shapes at higher orders.

A Low pass filter is a filter that passes low-frequency signals but attenuates signals with frequencies higher than the cutoff frequency.

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