Answer: JFET is a voltage-controlled device.
It doesn’t need a biasing current as the electric charge flows between the source and drain terminals. The current between the drain and the source can be controlled by gate-source voltage. It depends on the principle of a depletion region, hence sometimes it is also referred to as a depletion-mode device. In 1945, Heinrich Welker got the first patent of the JFET. It is doped to accommodate positive charges (holes) or negative charges (electrons). When both source-gate and drain-source potentials are zero, the JFET is in cut-off mode and hence does not conduct current.
Summary:
What is JFET?
JFET is voltage controlled device. It is a semiconductor device that has three terminals source, drain, and gate. JFET and Bipolar transistors are similar in appearance.
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