Now, can you guess what gate terminal is analogous to? If you are thinking of water tap then yes, you are correct. Let’s have a quick look at the below diagram, after that understanding the concept of FET will be a cake walk. The water source can be understood as the source of FET, the vessel which collects water is analogous to the drain terminal of FET. Analogies often make things simple to understand even a complex concept.
To understand how an FET works, let’s use an analogy. Water Analogy to understand the concept of FET This is the reason FETs are termed as a unipolar device. Thus, the conduction in BJTs involve majority carriers as well as minority carriers, but the conduction mechanism in FETs is only due to majority charge carriers. On the contrary, the FETs uses an electric field to vary the depletion width during reverse biasing of the junction. The BJT uses injection and collection of minority charge carriers, and this process of injection and collection is done during forward biasing of the P-N junction. bipolar transistor.Īlthough both are transistors and both, involve conduction of current and also both have three terminals, but the similarities end here. But there exists a vast difference between FET and BJT, i.e. The transistor in its name is often confused with a bipolar transistor.
Significance of FETīefore discussing the significance of FET, I would like to share the crucial concept regarding FET. This is because during the 1940s the research was going on semiconductors at Bell laboratories. It was in the year 1940, the significance of FETs gain momentum. But by this time FETs were not much popular. After this in the year 1935, Heil had also put light on field effect transistor. In the year 1926, the idea of field effect transistor (FET) was introduced by Lilienfield. The circuit symbol described in the below diagram clearly illustrates the three terminals of field effect transistor.
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