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Differentiate between Butterworth and chebyshev filter
This filter has cutoff frequency not equal to passband frequency $\Omega_{c}=\Omega_{p} /\left(\frac{1}{A_{p}^{2}}-1\right)^{\frac{1}{2 N}}$ This filter has cutoff frequency equal to passband frequency $\Omega_{c}=\Omega_{p}$
All poles of filter will always lie on circle having radius $r =\Omega_{c}$ All the poles of a filter will lie on ellipse having major axis 'R', '$\zeta$', minor axis 'r'