Field Effect Transistor:
The Field Effect Transistor is the semiconductor device, which relies for its operation on the control of current by the electric field. There are generally two types of field effect transistors:
1. JFET (Junction Field Effect Transistor)
2. MOSFET (Metal Oxide Semiconductor Field Effect Transistor)
The FET has a number of advantages over the conventional transistor.
1. In the conventional transistor, the operation depends on the flow of the majority and minority carriers. This is the reason it is called as bipolar transistor. In FET operation depends upon the flow of majority carriers only. It is known as unipolar device.
2. The input to the conventional transistor amplifier involves a forward biased PN junction with its inherently low dynamic impedance. The input to FET involves a PN junction which is reverse biased hence the high input impedance of the order of M- ohm.
3. It is much less noisy than the bipolar transistor.
4. It poses no offset voltage at zero drain current.
5. It also has thermal stability.
6. It is relatively resistant to the radiation.
The basic disadvantage is its relatively small gain bandwidth product in comparison with the conventional transistor.
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