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Why FET is called unipolar ?

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MSRA

MSRA

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Why FET is called UNIPOLAR...?
as i think BJT is called bipolar because of the presence of both holes and electrons..?
 

Re: BI/UNI POLAR

True, BJT is called bipolar because of presence of holes and electrons. In FET we use only electrons or holes, not both... It depends of type of FET. In FET the current is transfered only using holes or electrons. When you apply some voltage on its gate, you will just change the resistance of chanal that has only one type of cariers...
 

Re: BI/UNI POLAR

it is based on the carriers used for carrying current... in bjt it is due to both holes and electrons which is not the case for FET....
 

BI/UNI POLAR

If nmos its electroncs
If pmos its Holes

So Unipolar .. hope it helps :)
 

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