A given JFET has values of gm0 = 1200 μS and VGSoff) = -4 V. What is the value of gm for the device at VGS = -2 V?
A) 600 μS
B) 1200 μS
C) 300 μS
D) Cannot be determined with the information given.

Question

Quizplus · Accepted Answer

The transconductance (gm) for a JFET can be calculated using the formula gm = gm0 * (1 - VGS/VGSoff), where gm0 is the maximum transconductance, VGS is the gate-source voltage, and VGSoff is the gate-source cutoff voltage. Plugging in the given values: gm = 1200 μS * (1 - (-2)/(-4)) = 1200 μS * 0.5 = 600 μS.

A Given JFET Has Values of Gm0 = 1200 μS