StemQ Notice: The following is an answer to this question
The question is little bit unclear. If you are asking about uniqueness of FET, I should perhaps compare it with BJT I guess.
- The first unique feature of FET(field effect transistor) is that it is a voltage controlled device. The output current is modulated using the input voltage. But a BJT(bipolar junction transistor) is a current controlled device. The output current is modulated using the input current.
Figure created by myself
- FETs have a higher input impedance in general(comparing to BJTs).
- In BJT current flow happens as a result of participation of both majority and minority carriers. FETs doesn't have any minority carriers.
- I think FETs are power efficient than BJTs.
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