Placing an RC from feedback to EA Vout makes a zero. A parallel RC from Vout to feedback pin is another zero.
Pole = series RC from Vout to feedback pin
= parallel RC from feedback pin to EA Vout pin/node.
These transistors in cut-off are probably the unwanted feedforward paths you are looking for.
Sure, but no second AC source in the power supply. You can either measure PSSR or loop gain, but not both at the same time.Middlebrook method requires an AC source "AC 1" on the feedback path.
but no second AC source in the power supply
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