1. This would cause poor transient response in the control loop due to low phase margin . 2. Loop parameters commonly examined for this are the loop's gain margin and phase margin . 3. Another equivalent measure of proximity to instability is the "'phase margin " '. 4. Figures 8 and 9 illustrate the gain margin and phase margin for a different amount of feedback ?. 5. The recurrence may be in the form of a varying voltage or a varying gain or phase margins . 6. Tools include the root locus, the Nyquist stability criterion, the Bode plot, the gain margin and phase margin . 7. Phase margin indicates relative stability, the tendency to oscillate during its damped response to an input change such as a step function.8. In a controls sense, the oscillation is the result of reduced phase margin induced by the lag of the pilot's response. 9. Phase margin and its important companion concept, gain margin, are measures of stability in closed-loop, dynamic-control systems.10. While phase margin comes from the phase where the loop gain equals one, the gain margin is based upon the gain where the phase equals-180 degrees.
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