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Stability analysis using Spectre

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ccw27

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So I am using the stb analysis to check the stability of my cmfb. Is phase of +180 equal to phase of -180?

Thanks

Added after 9 minutes:

So I just read somewhere that cadence computes the loop-phase by shifting it up by 180, so that unity gain frequency for the loop gain would correspond to phase margin in loop phase.

If this is true does this mean that if my phase starts @ -180 the loop is still stable since it would correspond to -360 or 0?
 

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