I'm trying to understand current mirror circuits and I've been reading this article. I'm unable to understand the input part of the circuit where the author says "Producing the opposite where the collector current controls the VBE is not possible in the conventional use of the device as a common emitter amplifier. The solution is to incorporate negative feedback." (refer to image).
I do not understand how the feedback is actually 'controlling' base to emitter voltage (Vbe).
From what I understand, the Base-Emitter junction is just like a diode with a fixed ~0.7V across it. So, no matter what current you give to the base through the feedback connection, won't Vbe be equal to ~0.7 volts? How are we actually controlling the output(Vbe) here?
