JFET and MOSFET transistors have a very different physical structure, but their analytical equations are very similar.
In the MOS transistors, there are defined the same regions of operation: cutoff, linear, saturation and breakdown.
The picture shows the curves of electrical characteristics of an NMOS transistor with the different regions of operation.
These regions of operation are briefly described below.
Cutoff region
We can verify that VGS < VT and the current ID is zero.
Linear region
The transistor behaves as a nonlinear resistive element, controlled by voltage. Check the following equations:
where
is a characteristic parameter of the MOS transistor, which depends on the k constant and the size of the transistor gate (width W and length L).
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MOSFET: Saturation and Breakdown regions >>
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