I'm working on this circuit below:
What is the functionality of R2 here? Stabilizing the input voltage? (If it was, it would've been connected in series, right?)
Electronic – JFET as an amplifier
amplifieranalogjfet
amplifieranalogjfet
I'm working on this circuit below:
What is the functionality of R2 here? Stabilizing the input voltage? (If it was, it would've been connected in series, right?)
Best Answer
It's used to bias the gate to 0 volts. Because an N channel JFET works with a range of negative voltages on the gate with respect to the source, biasing this way ensures that the JFET conducts a few mA of current causing the source to rise to a positive value. At this point equilibrium is reached due to negative feedback.