The isolation of the controlling Gate increases the input resistance of the MOSFET extremely high in the value of the Mega-ohms (M Ω ). The main difference between FET and MOSFET is that MOSFET has a Metal Oxide Gate electrode electrically insulated from the main semiconductor n-channel or p-channel by a thin layer of Silicon dioxide or glass. We will get into details later in this article. Practically speaking, MOSFET is a voltage-controlled device, meaning by applying a rated voltage to the gate pin, the MOSFET will start conducting through the Drain and Source pin. In some cases, MOSFETs are also be called IGFET (Insulated Gate Field Effect Transistor). So a MOSFET can be called the advanced form of FET. MOSFET stands for Metal Oxide Field Effect Transistor, MOSFET was invented to overcome the disadvantages present in FETs like high drain resistance, moderate input impedance, and slower operation. If you want to skip the theory, you can check out the article on popular MOSFETs and where to use them to speed your part selection and design process. In this article, we will learn the Basics of MOSFET, its internal construction, how it works, and how to use them in your circuit designs. Compared to BJT, MOSFET can handle high voltage and high current, hence it is popular among high power applications. Next to BJT, the widely used power switches are MOSFETs. The most basic of them all is the BJT, and we have already learned the working of BJT Transistors. are essential devices used in the design of many circuits ranging from a simple driver circuit to complex Power rectifiers and Inverters. Power Electronic Switching components like BJT, MOSFET, IGBT, SCR, TRIAC, etc.
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