A transistor is formed by sandwitching p-type semiconductor material in between two n-type semiconductor material or n-type semiconductor material in between two p-type semiconductor material. It is also known as Bipolar junction transistor as in this device conduction takes place by motion of both polarity particles ie electrons as well as holes.
Every transistor has three terminals:
1.EMITTER : This terminal supplies large number of majority carriers and is heavily doped. This terminal is always forward biased wrt base in order to supply high majority carriers.
2.BASE : The middle sections forms two pn junctionsbetween emitter and collector is called base.It is lightly doped.
3.COLLECTOR : This section collects major portion of majority carriers supplied by emitter. The collecor base junction is always reverse biased. It is moderately doped.
Every transistor has three terminals:
1.EMITTER : This terminal supplies large number of majority carriers and is heavily doped. This terminal is always forward biased wrt base in order to supply high majority carriers.
2.BASE : The middle sections forms two pn junctionsbetween emitter and collector is called base.It is lightly doped.
3.COLLECTOR : This section collects major portion of majority carriers supplied by emitter. The collecor base junction is always reverse biased. It is moderately doped.
