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Control SystemsBode Plot

A first-order pole factor 1/(1+jω/ωp) contributes approximately how much phase at ω=ωp?

  • A0°
  • B-45°
  • C-90°
  • D-180°
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Correct Answer: B. -45°
Explanation: At its corner frequency, a first-order pole contributes -tan^-1(1)=-45°.
Reference: Standard control systems: bode plot
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