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I am going to talk about the basic operation MOSFET.MOSFET stands for metal oxide
semiconductor field-effect transistor. Like any conventional transistor, it is a type of
transistor with many applications in modern power electronics. Moreover, its functioning
is based on how electricity flows through it. It is important to note that there are many
variations in the uses of the MOSFET in different circuits. In MOSFET, the voltage applied
to the gate region determines how much current flows from drain to source. And, this
property gives MOSFETs their name – Metal Oxide Semiconductor Field Effect Transistors.
Interestingly, these transistors can amplify a signal or let only one specific kind of electric
charge carrier through.There are three basic types of MOSFETs. The first type is the “N-
channel enhancement-mode MOSFETs” or usually on (n-channel MOSFET). It allows
current flow through the channel between drain and source even with zero input voltage
applied across its terminals. Also, this means that it needs no gate signal for operation and
hence is helpful in simple digital circuits.The second type of MOSFETs are the “N-channel
depletion-mode” or usually off (n-channel). This type requires a negative voltage for it to
turn on and allow the flow of electric currents. Also, it has an advantage since this type of
transistor acts as a resistor when it is off. Hence, very useful in specific applications that
require control of input voltage.Thirdly, the “P-channel depletion-mode MOSFET
transistor” is usually off (p-channel MOSFET). This type blocks any current to flow through
it unless a positive charge flows across its terminals. It means that this type of transistor
acts as an insulator. Therefore, it is not suitable in specific applications where it is
necessary to pass current at all times.What is a MOSFET? How MOSFETs Work? (MOSFET
Tutorial) – YouTube Links to an external site.