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A diode had a transition capacitance of 1pF and depletion width of 1 µm. The capacitance changes to 10 pF when the depletion width changes. The final depletion width is __________(a) 10 µm(b) 0.1 µm(c) 1 µm(d) 100 µmThis question was addressed to me in an interview.This intriguing question originated from Transition Capacitance in portion Diode Circuit of Analog Circuits

Answer»

The correct option is (b) 0.1 µm

Best 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 and capacitance are inversely proportional

Depletion width decreases to 0.1 µm.



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