Trying to measure H parameters with a curve tracer, I have seen that the Vbe drops when transistor is active region, BC547. I dont find any explantion looking the Ebers-Moll transistor model,equations and theory, and Gummel-Poon.
Anyone can explain why it drops?
First photo is Ic vs Vce, second Ic vs Vbe, and third Ic vs Vbe x10
I have tried the same with other transistors and others curve tracers with the same result.
Thanks