Phase and Gain Margins

Phase Margin is defined as the phase difference between ∠βA(f0dB) and -180°, where f(0dB) is the frequency at which |βA|=1.

Gain Margin is defined as the difference between 0dB and |βA| where the loop gain phase is -180°. Gain and phase margins are used to determine if the amplifiers are stable or not. If the phase margin is less than 0° , it indicates instability and oscillation. if the phase margin is larger than 0°, it indicates the opposite, i.e. stability.

GainPhaseMargins.png

  Return to Top

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.