Circle the best answer or fill in the blank for each of the Following For an n c

Question

Circle the best answer or fill in the blank for each of the Following For an n channel JFET the source is (negative, positive) relative to the drain, and the gate is normally (negative, positive) relative to the source. For a p channel MOSFET the source is (positive, negative) relative to the drain and the transistor is turned on by making the gate (positive, negative) relative to the source. A p channel JFET is pinched off when the gate is very (positive, negative) relative to the source. The depletion zone of a pn junction gets (wider, narrower) when the junction is reverse biased. A pn Junction is reverse biased by making the p side (positive, negative) relative to the n side. Whenever p and n type silicon are joined together, a depletion zone forms at the junction. The built in electric field in the depletion zone points toward the (n doped, p doped) side of the junction. The reason n type silicon outside a depletion zone is not negative is that in addition to conduction electrons, it also contains The resistance of pure silicon (increases, decreases) when the temperature is raised.

Explanation / Answer

(a) For an n-channel JFET, the source is NEGATIVE relative to the drain and the gate is normally POSITIVE relative to the source.

(b) For an p-channel MOSFET, the source is POSITIVE relative to the drain and the transistor is turned on by making the gate NEGATIVE relative to the source.

(c) A p-chanel JFET is pinched of when the gate is very NEGATIVE relative to the source.

(d) The depletion region of a pn junction gets WIDER when the junction is reverse biased. A pn junction is reverse biased by making the p-side NEGATIVE relative to the n-side.

(e) Whenever the p and n type silic are joined together, a depletion zone forms at the junction. The built in electric field in the depletion zone points toward the P-DOPED side of the junction.

(f) The reason n-type silicon outside a depltion zone is not negative is that in addition to coduction electrons, it also contains holes which can recombine with electrons to netralize the charge.

(g) The resistence of pure silicon DECREASES when the temperature is raised.

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