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The 4th order butterworth filter having roll of  Answer dB/decade

Question

The 4th order butterworth filter having roll of  Answer dB/decade

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Solution

It seems like your question is incomplete. A 4th order Butterworth filter has a roll-off rate of 80 dB/decade. This is because each order of the filter contributes 20 dB/decade to the roll-off rate. Therefore, a 4th order filter would have a roll-off rate of 4*20 = 80 dB/decade.

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