Question

If the cross-sectional area of the channel in n-channel JFET increases, the drain current__________

(a) is increased

(b) is decreased

(c) remains the same

(d) decreases exponentially then increase

This question was addressed to me in final exam.

My doubt stems from Transconductance Amplifiers topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

Answer 1

The correct choice is (a) is increased

For explanation: The gate source junctions are reverse biased as a result depletion regions from which extend to the bar by changing gate to source voltage; effective cross sectional area decreases with the function of the gate to source voltage. With increasing the cross section area of the channel, the drain current is increased.