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What is the dependence of the transition capacitance on relative permittivity?(a) Inversely proportional to relative permittivity(b) Directly proportional to relative permittivity(c) Independent of relative permittivity(d) Directly proportional to relative permittivity with a degree of 2I got this question in a job interview.Asked question is from Transition Capacitance in section Diode Circuit of Analog Circuits

Answer»

The correct CHOICE is (b) DIRECTLY proportional to relative permittivity

For 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

Relative permittivity is directly proportional to the permittivity of the material.



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