We want the current to flow from the drain to the source in a MOSFET. As a result of the internal connection between the source and substrate terminals, the MOSFET we observe has three terminals, all of which are at the same potential, preventing any current from flowing from the substrate to the source, The source and drain can be switched since the MOSFET is symmetrical. There is a thin layer of insulator or dielectric between these terminals, and another terminal termed the gate terminal, is attached above the insulator, As seen in Figure 4, the MOSFET's four terminals are as follows: The source terminal is one of the two terminals connected to the yellow, while the drain terminal is the other. The substrate or substrate terminal is the terminal attached to the blue. An n-type semiconductor is shown in yellow, whereas a p-type semiconductor is shown in blue. The structure of the MOSFET is shown in Figure 3. Let's start with N-channel enhancement-mode MOSFETs. There are two types of MOSFETs: enhancement and depletion, which are further classified into N-channel and P-channel.Īn N-channel MOSFET is the type of MOSFET we've been discussing. The depletion layer will rise if the battery's polarity is changed, which is known as reverse bias. The depletion layer is minimized when the p-type is connected to the positive electrode of the battery and the n-type is connected to the negative electrode of the battery. The depletion region is the name given to this location. If we join them, as shown in Figure 2, n-type electrons will fill the holes in the p-type at the junction, depleting the charge near the junction. The majority of charge carriers are found in the p-type hole. The resulting semiconductor is p-type if the impurities are trivalent. The majority of charge carriers in n-type electrons. The resulting semiconductor is n-type if the impurities are pentavalent. Two sorts of impurities are put into pristine crystals to make a semiconductor a good conductor. The MOSFET is made of a semiconductor material like silicon, which possesses conductivity in the range of a conductor and an insulator. Electrons move in the opposite direction from the electric field or current, from the negative electrode to the positive electrode. The electric field passes from the positive electrode to the negative electrode outside the battery in the circuit shown in Figure 1. Do you understand how the circuit's current and electrons flow? You may be familiar with MOSFETs as an electronic engineer, but have you truly mastered them? In this post, we'll go over the fundamentals of current and semiconductors, as well as the area and construction of MOSFETs and their circuit symbols.įirst, let me ask you a question. Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is a basic component of modern electronic goods and is abbreviated as FET.
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