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

Practice Questions

Q1
What does a phase margin of less than 0 degrees indicate?
  1. The system is stable.
  2. The system is marginally stable.
  3. The system is unstable.
  4. The system has a high gain margin.

Questions & Step-by-Step Solutions

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.
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