An oxide layer is deposited on the substrate to which the gate terminal is connected. The construction of a MOSFET is a bit similar to the FET. The following figure shows how a practical MOSFET looks like. The FET is operated in both depletion and enhancement modes of operation. This is also called as IGFET meaning Insulated Gate Field Effect Transistor. MOSFET stands for Metal Oxide Silicon Field Effect Transistor or Metal Oxide Semiconductor Field Effect Transistor. To overcome these disadvantages, the MOSFET which is an advanced FET is invented. 572-78, 2007.FETs have a few disadvantages like high drain resistance, moderate input impedance and slower operation. Appenzeller, "Impact of dimensionality on the performance of tunneling FETs: Bulk versus one-dimensional devices," ScienceDirect, vol.
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