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stb analysis phase plot starting from 0 degree

apple419

Hello,

   I am doing a stb analysis on a opamp which is in unity-gain configuration.

   At some process corners, the phase plot actually stats from 0 degree and then goes up to 90 then falls back.

   I checked the transient simulations and it looks fine, without stability issues.

   So why phase starts from 0? does this mean at DC there is a positive feedback?

Thanks a lot!

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