Q.Describe briefly the construction of n-channel JFET.

An n-channel JFET is built on a bar of n-type semiconductor into which two p-type gate regions are diffused, leaving an n-type channel between them. …

[!TLDR]

An n-channel JFET is an n-type bar with two p-type gate regions diffused on its sides; the n-region between them is the channel and ohmic contacts give the drain and source.

The construction starts with a bar of n-type semiconductor. On its two opposite sides, two heavily doped p-type regions are diffused, so that two pn junctions are formed on either side of the bar. The n-type space left between these two junctions is called the channel, and it is the path through which charge carriers flow. The two p-type regions are connected together internally and brought out as a single terminal called the Gate. At the two ends of the n-type bar, ohmic (non-rectifying) contacts are made and brought out as the Drain and the Source terminals. Because conduction is th …