Question

Assume an n-channel JFET has a VGS(off) of i8 ∨. If gate-source voltage is (VGS =−4 V ), calculate the drain current ID flowing in the circuit.

A. 1/2 Idss
B. 1/4 Idss
C. Idss
D. 3/4 Idss

Answer 1

The drain current ID flowing in the circuit can be calculated using Ohm's law and the given information. The formula for the drain current in an n-channel JFET is ID = IDSS(1-(VGS/VGS(off))^2). Given that VGS(off) = 8 volts and VGS = -4 volts, the drain current ID is 3/4 IDSS.

Step-by-step explanation:

The drain current ID flowing in the circuit can be calculated using Ohm's law and the given information. The formula for the drain current in an n-channel JFET is ID = IDSS(1-(VGS/VGS(off))^2). Given that VGS(off) = 8 volts and VGS = -4 volts, we can calculate the drain current ID as follows:

First, calculate (VGS/VGS(off))^2 = (-4/8)^2 = 1/4.

Next, substitute this value into the formula ID = IDSS(1-(VGS/VGS(off))^2) = IDSS(1-1/4) = IDSS(3/4).

Therefore, the drain current ID flowing in the circuit is 3/4 IDSS, option D.