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Why do some op amps' datasheet specify phase margin at open loop?

Yes - it is a mistake. The wording just below the diagram ("Gain and phase vs. frequency") is correct. The phase margin (PM) is just one point of the phase response (it is app PM=60deg). ...
LvW's user avatar
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9 votes

Why do some op amps' datasheet specify phase margin at open loop?

Shouldn't it be just phase? I agree. It makes no sense to draw a graph like this and call it phase margin because, phase margin usually only occurs in one place i.e. where the open-loop gain is unity....
Andy aka's user avatar
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2 votes

Why do some op amps' datasheet specify phase margin at open loop?

The only difference I see is that they've subtracted 180° from the open-loop phase shift to get 'phase margin' on some op-amp datasheets.
Spehro Pefhany's user avatar

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