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Can we interchange the collector and emitter terminals in a transistor?
No, we cannot interchange emitter and collector of a transistor due to following reasons: (i) In a transistor emitter is heavily doped and collector is comparatively lightly doped.
How is emitter different from collector?
The main differences between emitter and collector are doping concentration and size. The emitter is heavily doped, while the collector is lightly doped. You could try to swap them, but you’ll get a very low HFE, probably even less than 1.
Why does the transistor work with collector and emitter?
The transistor is in reverse active mode. The collector acts as the emitter and the emitter as the collector. This is possible because NPN reversed is still NPN. The performance is worse than in forward active mode, because emitter and collector usually have different doping levels and a different structure.
Which is transistor circuit uses common emitter amplifier?
The common emitter transistor amplifier circuit is one of the mainstay circuits for use within electronic circuit design offering many advantages.
Which is more doped the collector or the emitter?
The doping of base, emitter and collector all are different, with emitter being the most doped. But although emitter is more doped than collector, width of collector is more than emitter so total number of charge carriers remains almost same in both emitter and collector. So it does not make a difference if emitter and collector are exchanged.
Why is the inversion 180° in a common emitter amplifier?
Common emitter input output phase relationship. The common emitter transistor amplifier is the only configuration that gives an inversion, 180°, between the input and output signals. The reason for this can be seen from the fact that as the input voltage rises, so the current increases through the base circuit.