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Explain what happens to the pn junctions when the gate is reverse biased? |
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Answer» When the gate is reverse biased, the depletion regions are extended towards the channel by the application of reverse bias voltage. When VGS = OV, is when gate terminal is open, the drain current is maximum and flows from drain to source called LDss . If VGs is increased, the reverse bias across the junction increases reducing the width of the channel. This makes the drain current decrease. Further increase in the reverse bias voltage widens the depletion region and the drain current ID further decreases. Thus the drain current in the device is mainly controlled by the reverse voltage applied across the gate-to-source voltage. |
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