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loop stability with different breakings

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dahuangpeng

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when i did the ac simulation for a ldo,i find a funny problem. when i break the loop at the op input of feedback, i have a PM about 80. when i break the loop at the op output,i have a PM about 30, and the main pole become bigger, why was it happend.
 

A better question title would be "how to measure loop gain correctly?".

There are various previous threads, see the "similar threads" tab below. You can also google for Middlebrook's method of loop gain analysis.
 
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