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AnonymousPT
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Unlike BJT, Why the minority charge carriers in FET do not participate in conduction? What is actually happening with the minority charge carriers?
A Field Effect Transistor (FET) is a type of semiconductor device that uses an electric field to control the flow of current. It consists of a source, a drain, and a gate, which is separated from the channel by an insulating layer. The gate voltage controls the flow of minority charge carriers in the channel, creating an electric field that changes the conductivity of the channel and thus controls the output current.
Minority charge carriers are electrons or holes that are present in a material in smaller quantities compared to the majority carriers. In a p-type semiconductor, the majority carriers are holes, while in an n-type semiconductor, the majority carriers are electrons. In a FET, the minority charge carriers are controlled by the gate voltage, allowing for precise control of the output current.
A FET works by controlling the flow of minority charge carriers in the channel between the source and drain. When a positive voltage is applied to the gate, it creates an electric field that attracts the minority carriers towards the channel, allowing for a larger current to flow. When a negative voltage is applied, the electric field repels the minority carriers, reducing the current flow.
FETs have several advantages over other types of transistors. They have a high input impedance, meaning they require very little input current to control the output. They also have a low output impedance, allowing for a large output current. FETs are also smaller and more reliable than other transistors, making them ideal for use in integrated circuits.
FETs are used in a variety of electronic devices, including amplifiers, switches, and digital circuits. They are also commonly used in power supplies, voltage regulators, and audio equipment. FETs are also an essential component in many electronic devices such as computers, smartphones, and televisions.