Given this circuit:
I don't understand why, when simulating it by increasing parametrially the V2 from 0V to 12V keeping V1 constant, the base current decreases exponentially until V2 reaches the V1. I understand that when V2 > V1 the bjt enters in the direct active region and then the Vce increases, keeping the collector current almost constant. But I don't see why the base current should decrease until V1 <= V2. This reduction is more higher than the Vbe variation. Sorry if it is a stupid question.
I've noticed that when simulating an emitter follower, and I thought that was due to the emitter drop that this base current was reducing. But that happens also in that circuit above.
EDIT: I've discovered that this decrease is coherent with the increase of the Vbe voltage, with a given base resistor. So the question is: why the Vbe increase while the BJT exits from its saturation state? Perhaps that answer is more easy, I think.