The MOSFET acronym stands for Metal Oxide Semiconductor Field-Effect Transistor. MOSFETS come in P-Type and N-Type configurations.  The fundamental theory behind a MOSFET comes as a result of the layered design and fabrication techniques implemented to create the device. In the case of the n-channel enhancement MOSFET, the body is made of a P-Type material with two heavily doped (N-Type) areas leading to the Source and Drain Leads. Above the body there exists a metallic surface connected to an isolated oxide layer, leading to the Gate. Due to the nature of this isolation, no current flows through the Gate.

There are 3 primary regions of operation for the MOSFET: Triode, Saturation, and Cutoff. Analysis of the p-channel MOSFET will lead to similar conclusions. However, since the voltages and currents are all in different directions, the formulas have to be modified.  In each of these configurations, special characteristics and functions can be exploited, making the MOSFET a very functional and fundamental device in non-linear circuit design.

What Are MOSFETs Used For...

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