Semiconductor devices (III) FET

Catalog

Field effect tube ：FET ( Filed Effect Transistor)

​ classification ：​

1.1 N Channel Junction FET Junction Field Effect Transistor

1.2 P Channel Junction FET Junction Field Effect Transistor

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Field effect tube ：FET ( Filed Effect Transistor)

A carrier participates in conduction , A triode that uses the electric field effect of the input circuit to control the current of the output circuit , also called Unipolar triode .

classification ：

1.1 N Channel Junction FET Junction Field Effect Transistor

•   Apply a forward voltage between the drain and source ,N In a semiconductor Most carriers - Electronics Can conduct electricity .
• Apply a reverse voltage between the grid and the source , The depletion layer will widen , The width of conductive channel decreases , Increase the resistance of the channel itself , Drain current ID Reduce , conversely , Drain electrode ID The current will increase
• The width of the depletion layer changes mainly in the channel region .

 1.2 P Channel Junction FET Junction Field Effect Transistor

 P The channel FET is in P Both sides of the silicon rod are made of highly doped N Type area (N+), The conductive channel is P type , Most carriers are holes .

P Type and N type The polarity of the applied voltage is opposite , Consistent performance