Discussion
How does self bias set a junction field effect transistor's operating point?
Answer: C
Drain current through the source resistor raises the source above ground while the gate sits at ground through its bias resistor, so the gate is negative with respect to the source - exactly the reverse bias a depletion device needs. One resistor produces the required polarity without any second supply, which is why self bias is the standard arrangement for these devices and has no bipolar equivalent. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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