Discussion
Why is a junction field effect transistor called a depletion-mode device?
Answer: B
With zero gate voltage the channel already conducts, and reverse-biasing the gate widens the depletion region until the channel is pinched off. Forward biasing the gate would conduct through the junction and destroy the control. The doping is normal, and the drain current actually saturates rather than falling. Whether a device conducts or blocks at zero gate voltage is the single distinction between depletion and enhancement modes, and it decides the whole bias arrangement.
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