IGNOU BPHET 143 2026 - Draw the structure of an n-channel JFET with appropriate voltage bias

Question

Draw the structure of an n-channel JFET with appropriate voltage bias and explain the process of pinch-off. Explain the various regions on the drain characteristic of this JFET for V_DS > 0 and $V_{GS} = 0V$ .

19 Jan 2026

Answer :

Word Count : 298

An n-channel JFET (Junction Field Effect Transistor) consists of an n-type semiconductor channel with p-type regions on either side forming the gate. The source (S) is connected to one end of the n-channel, the drain (D) to the other, and the gate (G) is reverse-biased with respect to the source. For proper operation, the gate-source voltage ( V_{GS} ) is usually negative (reverse bias), and the drain-source voltage ( V_{DS} ) is positive for n-channel JFETs. When a positive (

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