CodePudding user response:
Op-amp basic logic can solve, short break, from the current view, If the Ui rise, U Σ unchanged, 2=(Ui - U Σ)/R1, Ii rise, op-amp is broken, the If=Ii, If increase, the If=(U Σ - Uo)/R2, so Uo to drop, the op-amp is the logical solution,On the principle of analytical I suggest you look at the interior of the op-amp circuit structure, reasoning is eventually tend to virtual short virtual fault as a result,