One can take it one step further and make an active diode switch with low voltage as in Case A below .
It has a similar threshold but you ca ndrop this with a fixed voltage and R bias to lower the 0.6V threshold at 1mA.
This is extremely useful for CC regulators using a drop of <=100mV instead of >= 0.6V.
But notice how the voltage drop in A for Vce decreases with increasing current from negative feedback.
Comments? Does this make sense to everyone?
View attachment 141597 sim link