The direction of the arrowhead reflects the direction of the electric field.Three terminals can be seen in the figure namely gate, source, and drain represented by D, G, and S.
The following figure shows the symbol of a field effect transistor.Unipolarity of the field effect transistor means that the transistor uses either holes or electrons for working, depending on the type of material being implied for making, unlike the bipolar junction transistors which employ both the electrons and holes for their functioning. All these successful and unsuccessful attempts led to the formation of the modern-day Field Effect Transistor. In successive years several attempts were made and different types of materials were introduced for making field-effect transistors and their related types.In 1945, the Junction field-effect transistor was the first FET device to be constructed by Heinrich Welker.In 1934, Oscar Heil tried his luck but failed to make a successful attempt.The first attempt to make a field-effect transistor was made by Julius Edgar in 1925, and sadly he failed miserably but he was lucky enough to get the concept patented.To know how the field effect transistors evolved throughout the ages, let us have a quick trip to history, the days when we did not have a large amount of resources to materialize our concepts."The Field effect transistor is a unipolar transistor made up of semiconductor material, which uses an electric field to control the current flow.".Let us define field effect transistor first, If you have a brief idea about transistors, you must be aware of the field effect transistor or you might have heard or read about it somewhere, it is one of the earliest known types of transistors which is our topic of discussion today.įield Effect Transistors were made to cover up the lacking of previously known transistors which occupied large space and produced a lot of noise, another major problem was the low reliability of previous versions. We have been discussing transistors lately, from the basic definition to the types and characteristics of transistors we have covered it all. Hello friends, I hope you all are happy, healthy and, content.
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