Question

For the operation of a N-channel JFET, the gate voltage has to be

A. low positive
B. zero
C. high positive
D. high negative

Answer 1

The correct gate voltage for the operation of an N-channel JFET is a high negative voltage, which controls the current flow through the device by depleting the channel of carriers.

Step-by-step explanation:

For the operation of an N-channel JFET (Junction Field-Effect Transistor), the gate voltage needs to be negatively biased to control the electric current flow through the device. When a high negative voltage is applied to the gate, it depletes the channel of carriers (electrons) and chokes off the current flow, thus acting as a variable resistor. The correct answer is D. high negative. By applying varying negative gate-source voltages, the conductivity of the N-channel JFET can be controlled. However, if the gate voltage is increased too much negatively, the JFET can enter what's known as pinch-off, where the channel closes entirely, and the current drops to nearly zero.