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For providing a Roll-off greater than 60dB/decade/pole, filters with which characteristics are useful?(a) Butterworth(b) Chebyshev(c) Bessel(d) Butterworth & BesselThe question was asked in an international level competition.This question is from Advanced Problems on Filters topic in division Filters and Attenuators of Network Theory

Answer»

Correct option is (b) Chebyshev

To explain: Roll off is a term COMMONLY refers to the steepness of the TRANSMISSION function with respect to the frequency. For a Chebyshev FILTER, the Roll-off value greater than 60. This characteristic feature is useful when a RAPID roll-off is REQUIRED because it provides a Roll-off rate more than 60. On the other hand, both Butterworth and Bessel have the Roll-off rate less than or equal to 60 dB/decade/pole.



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