Unipolar and Bipolar Transistor
A unipolar transistor is a FET that uses only one type of charge either electron (n-channel FET) or hole (p-channel FET) for conduction from drain to source.
Unipolar transistor has three terminals drain, source and gate. Current for the critical load flows through drain and source, which is controlled by a voltage applied to the gate. In depletion mode, increasing the voltage increases the depletion layer, thus restricts conductivity. In enhancement mode, increasing the voltage increases conductivity.
The biploar function transistors uses both charge carriers i,e; electrons and holes for conduction. For the operation purpose, BJT uses two semiconductor types n-type and p-type between two junctions. The main basic functions of a BJT is to amplify current. It will allows BJT’s are used as amplifiers or switches to produce wide applicability in electronic equipment.