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A minimum phase unity feedback system has a bode plot with a constant slope of -20dB/decade for all frequencies. What is the value of the maximum phase margins of the system?

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A minimum phase unity feedback system has a bode plot with a constant slope of -20dB/decade for all frequencies. What is the value of the maximum phase margins of the system?

(a) 0°

(b) 90°

(c) -90°

(d) 180°

I had been asked this question during a job interview.

The above asked question is from All-pass and Minimum-phase Systems topic in portion Frequency Response Analysis of Control Systems

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The correct option is (b) 90°

Easiest explanation: For given Bode plot, G(s) H(s) =K/jw

As H(s) =1

PM (maximum) =90°.

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