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P Channel Enhancement Type MOSFETs The body of a P-Channel eMOSFET is made by a lightly doped N-type substrate. While the source and drain are heavily doped with P-type impurities. These are the following features of a P-Channel eMOSFET. In this video, the Enhancement-Type MOSFET, its Construction, Working and, drain and transfer Characteristics have been explained.By watching this video you.
Transistors are the most popular semiconductors in the field of electronics. These are available in various types and configurations such as Bipolar-Junction Transistors (BJTs) and the Field-Effect Transistors (FETs) considered as the basic ones. These FETs are further classified as Junction field-effect transistors (JFET) and insulated gate field-effect transistors (IGFET). The transistor with input at the gate is insulated electrically from the main channel of current-carrying is referred to as IGFET or the metal oxide field-effect transistor (MOSFET). The electrode at the gate of these MOSFETs is made up of metal oxide. These MOSFETs operate in two modes and are classified as Enhancement MOSFET and Depletion MOSFET.
MOSFETs are usually classified into two types. They are Enhancement and the Depletion MOSFETs. The MOSFET that is basically in OFF condition which requires a certain amount of voltage at the terminal gate to turn ON is referred to as Enhancement MOSFET.
Due to the application of gate voltage the channel among the terminal of drain and source gets less resistive. If the applied voltage at the gate increases then the current flow from the terminals drain to the source increases until and unless it reaches its maximum point. The behavior of this type of MOSFET resembles the behavior of bipolar junction transistor (BJT).
The Schematic symbol of Enhancement MOSFETs of both p-channel and n-channel MOSFETs are:
Enhancement MOSFET Symbol
The steps involved in the construction of Enhancement MOSFET are:
Enhancement MOSFET Diagram
The operation of the Enhancement MOSFET are
Let us consider a situation when the positive amount of the voltage applied at the Drain- Source by keeping the gate voltage as zero.
Hence from the above points, it can be concluded that the channel conduction is enhanced based on the positive potential of the gate terminal.
The amount of current flow is dependent on the positive amount of the potential applied at the terminal gate. If the application of the potential is below the threshold then no current flow is evident through the terminal drain. If the voltage exceeds the threshold the device gets turned ON.
The Enhancement type MOSFET is well suited in the application areas where power devices are used. To increase the conductivity the amount of applied gate potential must also be increased. Because of the low resistance required to turn ON the device and high resistance offered while turning it OFF these devices are preferred for switching applications. After knowing the applications of Enhancement MOSFETs can you describe where the depletion-mode MOSFET is preferred?