Chebyshev Type II Filters (Inverse Chebyshev)

The Chebyshev Type II Filter, also known as the Inverse Chebyshev Filter, contains a Butterworth style, or maximally flat, pass band, a moderate group delay, and an equiripple stop band.

Like the Butterworth Filter, the pass band attenuation of the Chebyshev Type II Filter is defined to be -3.01 dB. However, Filter Solutions allows the user the option of selecting any pass band attenuation in dB's that will define the filters cut off frequency.

Below are examples of 5th order Chebyshev Type II low pass, high pass, band pass and band stop filters and the low pass step response. The stop band ratio is 1.2 in all cases shown. Compare the stop band attenuation and the group delay to that of the Hourglass and Elliptic Filters.