BJT-
- Bipolar transistor
- Current conduction takes place due to both electrons and holes
- BJT has negative temperature coefficient
- BJT has high volt gain
- BJT has no current gain
- Low input impedance
- More noisy
- Larger in size
- Small current is required to keep the device ON
- It is less thermally stable
- It is a current control device
- Low frequency application
- It has three terminals i.e. Emitter, Base, Collector
- During amplifier operation, BJT input circuit remains forward bias condition
- BJT is of two types i.e. NPN and PNP
FET-
- Unipolar Transistor
- Current conduction takes place either by electron or by holes
- FET has positive temperature coefficient
- FET has no volt gain
- FET has high current gain
- High input impedance
- Less noisy
- Smaller in size
- Small voltage is required to keep the device ON
- It is more thermally stable
- It is a voltage control device
- High frequency application
- It has three terminals i.e. Source, Drain, Gate
- During amplification, FET input circuit remains reversed biased condition
- FET is of two types i.e. JFET and MOSFET
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