Field Effect Transistors (FET) - Technical MCQs

Q1:

To get a negative gate-source voltage in a self-biased JFET circuit, you must use a ________.

A negative gate supply voltage

B ground

C voltage divider

D source resistor

ANS:D - source resistor

You can also have a negative VGS if you apply a negative gate supply voltage VGG. By performing KVL in the Gate-Source Loop -VGG-Vgs=0, Vgs = -VGG.

The same goes for a source resistor by performing KVL in the Gate-Source Loop -Vgs-IdRs = 0 Vgs = -IdRs.