The main advantage of FET is that it has a very high input impedance, which is in the order of Mega Ohms. It is a voltage controlled device unlike a bipolar junction transistor. Field Effect TransistorĪn FET is a three-terminal unipolar semiconductor device. The functionality, configurations and applications are all the same. A normal transistor which we had discussed in the previous chapters come under this category. The PNP transistor is made by placing an ntype material between two p-type materials.īJT is a current controlled device. The NPN transistor is made by placing a ptype material between two n-type materials.
The types of BJT are NPN and PNP transistors. The following image shows how a practical BJT looks like. Usually NPN transistor is preferred for the sake of convenience. It has got two types of configurations NPN and PNP.
This BJT is nothing but a normal transistor. Bipolar Junction TransistorĪ Bipolar junction transistor, shortly termed as BJT is called so as it has two PN junctions for its function. The primary transistor is the BJT and FET is the modern version of transistor. Each transistor is specialized in its application. There are many types of transistors in use.
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