Phase margin is:
A. It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability
B. It is always positive for stable feedback systems
C. It is calculated at gain cross over frequency
D. All of the mentioned
Answer:D
Phase margin is:
A. It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability B. It is always positive for stable feedback systems C. It is calculated at gain cross over frequency D. All of the mentioned
Explanation: Phase margin is the measure of relative stability which is always positive for stable systems.