Chebyshev Filter Frequency Response

Cuthbert Nyack
The poles of the Chebyshev filter approximation can be derived from the Chebyshev polynomials or calculated from Butterworth poles.

The poles can be calculated to give a response which has an attenuation of -3dB at the cut-off frequency or an attenuation equal to the ripple at the cut off frequency.

The 2 applets below show the 2 possible responses. Red and pink shows the amplitude with different scales, green the phase delay and cyan the group delay.

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COPYRIGHT 2005 Cuthbert Nyack.