What does a phase margin of less than 0 degrees indicate?

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Question: What does a phase margin of less than 0 degrees indicate?

Options:

Correct Answer: The system is unstable.

Solution:

A phase margin of less than 0 degrees indicates that the system is unstable, as it suggests that the system will oscillate uncontrollably.

What does a phase margin of less than 0 degrees indicate?

What does a phase margin of less than 0 degrees indicate?

Step 1: Understand what phase margin means. Phase margin is a measure of how close a system is to instability.
Step 2: Know that phase margin is measured in degrees. A positive phase margin means the system is stable.
Step 3: Recognize that a phase margin of 0 degrees means the system is at the edge of stability.
Step 4: Learn that a phase margin of less than 0 degrees indicates that the system is unstable.
Step 5: Understand that instability means the system will oscillate uncontrollably, leading to potential failure.

Phase Margin – Phase margin is a measure of system stability in control theory, indicating how much phase shift can be tolerated before the system becomes unstable.
System Stability – A system is considered stable if it returns to equilibrium after a disturbance; a negative phase margin indicates potential for instability.