Question

If the phase angle at gain cross-over frequency of a system is -116°, then the phase margin will be

• A. −64°
• B. 116°
• C. 64°
• D. −116°

Hint:

Phase margin is always measured from −180°, so use PM = 180° + (Phase at gain crossover).

Answer 1

The Correct Option is C

Phase margin (PM) = 180° + Phase at gain crossover frequency PM = 180° − 116° = 64°