1.

For providing a Roll-off greater than 20dB/decade/pole, filters with which characteristics are useful?(a) Butterworth(b) Chebyshev(c) Bessel(d) Butterworth & BesselThis question was addressed to me in an interview.The origin of the question is Advanced Problems on Filters in division Filters and Attenuators of Network Theory

Answer»

Correct option is (b) Chebyshev

For explanation I WOULD say: ROLL off is a term commonly REFERS to the steepness of the transmission function WRT to the frequency.

For a Chebyshev filter, the Roll-off value greater than 20. This characteristic feature is useful when a rapid roll-off is REQUIRED because it provides a Roll-off rate of more than 20.

On the other hand, both Butterworth and Bessel have the Roll-off rate less than or equal to 20 dB/decade/pole.



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