Wide Band Pass Butterworth Filter.

Cuthbert Nyack
A wide band pass response is obtained by having a low pass and high pass filter in series. The low pass must have a higher 3dB frequency than the high pass.

Applet above shows a wide band Butterworth response. Magnitude response is in red and pink. phase delay is in green and group delay is in cyan.

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COPYRIGHT 2005 Cuthbert Nyack.