In a Bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system ?
A
−80dB/decade
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B
−40dB/decade
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C
+40dB/decade
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D
+80dB/decade
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Solution
The correct option is A−80dB/decade A 4th order all-pole system means that the system must be having no zero or s-terms in numerator and s4 terms in denominator or 4-poles. i.e H(s)∝1s4
One pole exhibits −20dB/decade slope. So, 4 pole exhibits a slope of −80dB/decade