Field effect transistors

We can find Field effect transistors in 2 basic forms; junction gate & insulated gate. The gate source junction of a junction gate field effect transistor (JFET) is well a reverse-biased p-n junction.The gate connection of an insulated gate field effect transistor(IGFET), on the other end is insulated from the channel and charge is capacitively coupled to the channel. To keep matter simple, only JFET devices are considered in this tutorial. Diagram below presents the basic structure of an n-channel JFET.

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