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Which filter has maximum flatness?

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Which filter has maximum flatness?

(a) Chebyshev filter

(b) Butter-worth filter

(c) High pass filter

(d) Normalized filter

I got this question during an interview for a job.

Asked question is from Baseband Systems and Signal Transmission through Linear Systems topic in portion Signals and Spectra of Digital Communications

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Right answer is (b) Butter-worth filter

For explanation: Butter-worth filter as the best approximation to ideal filter and has the maximum flatness in the filter pass-band.

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