FET & BJT both are transistor. We know that there are two types of charge carriers (electron and hole) in a transistor. A bipolar junction transistor (bipolar transistor or BJT) is a type of transistor that uses both electron and hole charge carriers. The field-effect transistor (FET) is a transistor that uses an electric field to control the shape and hence the electrical conductivity of a channel of one type of charge carrier in a semiconductor material. This leads to some characteristics difference between them like below:
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