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Control SystemsBode Plot

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

  • A-90°
  • B-45°
  • C+45°
  • D+90° exactly at all frequencies
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Correct Answer: C. +45°
Explanation: At the zero corner frequency, phase is tan^-1(1)=+45°.
Reference: Standard control systems: bode plot
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