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WEBENCH® Tools: Phase + 180, Phase Margin

Jared Becker
Genius 11665 points

Tool/software: WEBENCH® Design Tools

Hi Team,

Quick question. When I run a simulation in Webench, I am looking to quickly understand how much phase margin I have in the design. The axis for phase is "phase + 180", thus to find out my phase margin, I should find the gain 0dB crossing point, identify the phase +180 value, and then subtract 180, correct?

For example, in the picture below, at ~0dB crossing, my phase +180 = ~76, therefore, is my phase margin = 76 - 180 = -104? This seems really large..

thank you!

Jared