Introduction to Field Effect Transistors (FET's) also similarity and difference

 Introduction to Field Effect Transistors (FET's)  also similarity and difference

• BJT and FET Both are 3 terminal devices
• BJT and FET's have nearly equal importance.
• BJT is a current-controlled device while FET's are voltage-controlled devices its the main difference between them. ( Ic=f(Ib) and Id = f(Vgs) )
•  BJT is a bipolar device and FET's are unipolar devices.
• FET's are of two types n -channel FET's and p-channel FET's.
•  FET's can be used as amplifiers or switches.
•  FET's are classifieds into two categories JFET and MOSFET
• JFET is classified into two categories n -channel and p- channel.
•  MOSFET is classified into DMOSFET and EMOSFET. and bother of them further divided into two categories n-channel and p-channel.
• FET's are known as Field effect transistors because there is an electric field is developed by the charge is present and this electric field controls the conduction path of the output circuit.So there is an effect of electric field and so this device is known as Field effect transistors.
  
• Input impedance: FET's have higher input impedance as compared to BJT's
• FET's are more temperature stable then BJT.
•  FET's are smaller then BJT.
•  BJT's are more sensitive to the applied signal as compared to the FET's.