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When the gain margin and phase margin have values as 0 dB, then the system is:

When the gain margin and phase margin have values as 0 dB, then the system is: Correct Answer Marginally Stable

  • The gain margin of the system defines by how much the system gain can be increased so that the system moves on the edge of stability
  • The phase margin of the system defines by how much the phase of the system can increase to make the system unstable
  • Since the gain margin and phase margin are both zero, this implies the system is on the edge of stability or the system is marginally stable
  • For a stable system, gain margin and phase margin are both positive
  • For an unstable system, gain margin and phase margin are negative

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