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A diode is replaced with another diode of different material. The ratio of relative permittivity of new material to old is 0.5. The initial capacitance was 20pF, then final capacitance will be __________

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A diode is replaced with another diode of different material. The ratio of relative permittivity of new material to old is 0.5. The initial capacitance was 20pF, then final capacitance will be __________

(a) 15pF

(b) 20pF

(c) 10pF

(d) 2pF

I have been asked this question in exam.

My enquiry is from Transition Capacitance topic in section Diode Circuit of Analog Circuits

1 Answer

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Best answer
The correct option is (c) 10pF

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 permittivity becomes half capacitance also halves.

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