Field-Effect Transistors

Abstract

Field-effect transistors are a more recent development than bipolar transistors, and make use of a completely different mechanism to achieve amplification of a signal. Field-effect transistors (FETs) are unipolar, and involve only one type of charge carrier (electrons or holes) in their operation. There are also two major types of FET, junction-gate field-effect transistors (JUGFETs) and insulated-gate field-effect transistors (IGFETs). There are, as we shall see, subdivisions within these two classes.