The specification in a high-pass Butterworth filter design is that the voltage transfer function magnitude at (f=0.9

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The specification in a high-pass Butterworth filter design is that the voltage transfer function magnitude at \(f=0.9 f_{3 \mathrm{~dB}}\) is \(6 \mathrm{~dB}\) below the maximum value. Determine the required order of filter.

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