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Transition capacitance of a diode is inversely proportional to __________

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Transition capacitance of a diode is inversely proportional to __________

(a) Area of cross section

(b) Width of depletion region

(c) Relative permittivity

(d) Drift current

I got this question during an internship interview.

The origin of the question is Transition Capacitance in division Diode Circuit of Analog Circuits

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The correct answer is (b) Width of depletion region

Best explanation: Transition capacitance is the capacitance exhibited by a diode due to the p-side and n-side of the diode is separated by a distance of depletion width same as in an electrolytic capacitor.

The equation of transition capacitance = ƸA/W

Where Ƹ = permittivity of the material of diode, W = depletion width

            A = area of cross section.

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