![]() The FET transistors have high current gain than BJT transistors. The FET transistors have control over the size and shape of a channel between source and drain which is created by an applied voltage. For the connections in the circuit, we also consider the fourth terminal called base or substrate. FET transistors are classified into Junction Field Effect transistors (JFET) and Insulated Gate FET (IG-FET) or MOSFET transistors. The FET transistors have three terminals they are gate (G), Drain (D), and Source (S). ![]() On the other hand, PNP transistors use Holes as their majority charge carriers and It consists of two p-type layers separated by an n-type layer.ΔΆ) Field Effect Transistors: Field-effect transistors, are unipolar transistors and use only one kind of charge carrier. It consists of two n-type layers separated by a p-type layer. In NPN transistors electrons are the majority charge carriers. BJTs are of two types known as NPN and PNP transistors. A bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between two other terminals, making the device capable of amplification or switching. 1) Bipolar Junction Transistors: A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and holes as charge carriers. ![]()
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