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For a diode the transition capacitance was 10pF. The depletion width changed from 1µm to 10 µm. All other conditions remain unchanged. The new diode capacitance is __________

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For a diode the transition capacitance was 10pF. The depletion width changed from 1µm to 10 µm. All other conditions remain unchanged. The new diode capacitance is __________

(a) 5pF

(b) 1.414pF

(c) 1pF

(d) 10pF

This question was posed to me in my homework.

This interesting question is from Transition Capacitance topic in chapter Diode Circuit of Analog Circuits

1 Answer

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Best answer
Right choice is (c) 1pF

Easy explanation: The equation of transition capacitance = ƸA/W

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

            A = area of cross section

Since depletion width increased 10 times and all other quantities are the same, the capacitance decrease by 10 times.

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