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For a diode the transition capacitance was 15pF. The diode is replaced with another diode of same material with twice cross sectional area. Terminal voltage remains unchanged. The capacitance of new diode is __________(a) 15pF(b) 30pF(c) 60pF(d) 7.5pFI have been asked this question in exam.Asked question is from Transition Capacitance in portion Diode Circuit of Analog Circuits

Answer»

The correct answer is (b) 30pF

For explanation I would SAY: The EQUATION of transition capacitance = ƸA/W

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

A = area of cross section

Since A becomes 2A capacitance ALSO DOUBLES.



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