Which of the following is NOT true for JFET?

Question

Question

Answer 1

JFET:

It is affiliated as junction field effect transistor
The types of JFET are n-channel FET and p-channel FET
A p-type material is added to the n-type substrate in n-channel FET, whereas a n-type material is added to the p-type substrate in p-channel FET.

F1 Jai Prakash Madhu 29.08.20 D9

JFET is a three terminal device and since gate voltage controls the drain current, JFET is called as voltage controlled device.
JFET’s have only depletion mode of operation.
When there is no potential applied between gate and source terminals and a potential V_DD is applied between drain and source, then a current I₀ flows from drain to source terminals at its maximum as the channel width is more.
When the voltage applied between gate and source terminal V_GG is reverse biased, this decreases the depletion width, thus the layers grows and the cross section of the channel decreases and hence the drain current I_D also decreases.
Thus drain current in JFET is controlled by changing the channel width.
Gate source p-n junction is always reverse biased because if it is forward then all the channel current will flow to the Gate and not to the source, ultimately damaging JFET.