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u put an iprobe between the opamp and the pass element and use the stability analysis to check the phase margin and for the psr u put 1V Ac on the supply and use ac analysis to get the transfer function from the supply to the output.
Which simulator engine do you use ?
If the program does not contain a specific stability analysis package you have to apply the stability definition: Simulate the ac response of the loop gain Lo(w) and determine the phase margin at the frequency where the magnitude Lo=1.