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Introduction To Field Effect Transistor – FET

This is small introduction about FET (Field effect Transistor) which is useful for ECE,EEE and other electronic related branches.

Introduction To Field Effect Transistor – FET


The Field effect transistor is a three terminal semiconductor device.The main difference between BJT and FET is in FET the output is controlled by the input voltage and it produces high input impedance,less noise,it occupies less space.The operation depends on only one type of carriers i.e., majority carriers.Hence the FET is preferred over BJT.

Features of Field Effect Transistor – FET

  • The operation of FET depends on the flow of majority charge carriers.
  • The input impedance of FET is very high in order of Mega Ohms (MΩ).
  • FET is less noisy than BJT.
  • It is simple to fabricate.
  • It occupies less space in Integrated Circuits (IC).
  • It exhibits no offset voltage at zero drain current

Classification and Types of FET :

Field Effect Transistor is classified into JFET and MOSFET.JFET is classified into n-Channel JFET and p-Channel JFET.MOSFET can be operated in two modes.They are Enhancement mode and Depletion Mode.So they are classified into Enhancement MOSFET and Depletion MOSFET which are again classified based on N and P Channels.

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