![]() ![]() In N-type material, the charge carriers are primarily electrons. In P-type material, electric charges are carried mainly in the form of electron deficiencies called holes. The junction FET has a channel consisting of N-type semiconductor (N-channel) or P-type semiconductor (P-channel) material the gate is made of the opposite semiconductor type. These are known as the junction FET (JFET) and the metal-oxide- semiconductor FET (MOSFET). This is how the FET amplifies signals.įield-effect transistors exist in two major classifications. A small change in gate voltage can cause a large variation in the current from the source to the drain. ![]() The conductivity of the FET depends, at any given instant in time, on the electrical diameter of the channel. ![]() The physical diameter of the channel is fixed, but its effective electrical diameter can be varied by the application of a voltage to a control electrode called the gate. At the other end of the channel, there is an electrode called the drain. At one end of the channel, there is an electrode called the source. In the FET, current flows along a semiconductor path called the channel. How a field-effect transistor (FET) works It can also switch DC or function as an oscillator. The device can amplify analog or digital signals. See also bipolar transistor and transistor.Ī field-effect transistor (FET) is a type of transistor commonly used for weak-signal amplification (for example, for amplifying wireless signals). ![]()
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