A JFET has the following ratings: VGSoff) = -2 V to -5 V and IDSS = 4 mA to 12 mA. This device is being used in a self-bias circuit. When the bias line for the device is plotted, it is found that VGS for the circuit will have a range of -1 V to -2.5 V. What are the corresponding Qmin) values?
A) VGSQ = -1 V, IDQ = 1 mA
B) VGSQ = -2.5 V, IDQ = 250 μA
C) VGSQ = -1 V, IDQ = 7.86 mA
D) Cannot be determined with the information given.

Question

Quizplus · Accepted Answer

The correct answer is A because the bias line is within the range of VGSoff) and IDSS, so the device is operating in the saturation region. In the saturation region, ID is independent of VGS, so IDQ will be equal to IDSS.

A JFET Has the Following Ratings: VGSoff) = -2 V