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Questions and Answers
The ___ margin is defined as the angle of 180° minus the magnitude of the angle at which the value 1/2ẞA1½ is unity (0 dB).
The ___ margin is defined as the angle of 180° minus the magnitude of the angle at which the value 1/2ẞA1½ is unity (0 dB).
phase
What is the relationship between phase margin and the angle at which |ẞA| is unity?
What is the relationship between phase margin and the angle at which |ẞA| is unity?
- Phase margin is equal to the magnitude of the angle.
- Phase margin is the angle of 180° minus the angle at |ẞA|. (correct)
- Phase margin is unrelated to the angle at which |ẞA| is unity.
- Phase margin is defined in terms of gain only.
Which of the following is true about phase margin?
Which of the following is true about phase margin?
- It indicates the phase relationship in feedback systems. (correct)
- It is always positive for stable systems. (correct)
- It measures the gain of the system.
- It is determined only at high frequencies.
In control systems, what does a phase margin of 0° signify?
In control systems, what does a phase margin of 0° signify?
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What is typically computed to find the phase margin in a feedback system?
What is typically computed to find the phase margin in a feedback system?
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How does increasing phase margin affect system response?
How does increasing phase margin affect system response?
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Study Notes
Phase Margin
- Phase margin indicates system stability in control theory.
- Calculated as 180° minus the angle at which the open loop gain |ẞA| equals unity (0 dB).
- A positive phase margin suggests a stable system, while a negative margin indicates instability.
- Provides a measure of the system's ability to tolerate variations in gain and phase without oscillating.
- Important in designing feedback control systems to ensure desired performance.
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