BJT

Question 1

Why is BJT called bipolar?

Answer 1

Because both electrons and holes (both polarities) contribute to the current in a bipolar process

Question 2

Which is most important BJT mode

Answer 2

Forward active (or just active) mode

Question 3

Where does forward active current gain come from?

Answer 3

electrons from emitter to base is more than holes from base to emitter, accomplished by heavily doped emitter and lightly doped base

Question 4

what are the minority carriers in the base

Answer 4

electrons are minority carriers in the p-type base. because base is lightly doped most will not be lost to recombination and most will diffuse to the collector.