Difference between BJT and FET


Difference between BJT and FET

BJT-

  1. Bipolar transistor
  2. Current conduction takes place due to both electrons and holes
  3. BJT has negative temperature coefficient
  4. BJT has high volt gain
  5. BJT has no current gain
  6. Low input impedance
  7. More noisy
  8. Larger in size
  9. Small current is required to keep the device ON
  10. It is less thermally stable
  11. It is a current control device
  12. Low frequency application
  13. It has three terminals i.e. Emitter, Base, Collector
  14. During amplifier operation, BJT input circuit remains forward bias condition
  15. BJT is of two types i.e. NPN and PNP

FET-

  1. Unipolar Transistor
  2. Current conduction takes place either by electron or by holes
  3. FET has positive temperature coefficient
  4. FET has no volt gain
  5. FET has high current gain
  6. High input impedance
  7. Less noisy
  8. Smaller in size
  9. Small voltage is required to keep the device ON
  10. It is more thermally stable
  11. It is a voltage control device
  12. High frequency application
  13. It has three terminals i.e. Source, Drain, Gate
  14. During amplification, FET input circuit remains reversed biased condition
  15. FET is of two types i.e. JFET and MOSFET

 

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