Question

In a diode, the change in voltage being applied across it is 2V. The change in minority carriers outside the depletion region is 1.2×10^-8. Find diffusion capacitance.

(a) 6 pF

(b) 6 μF

(c) 1.2 nF

(d) 6nF

I had been asked this question during an internship interview.

I need to ask this question from Diffusion Capacitance in portion Diode Circuit of Analog Circuits

Answer 1

Correct option is (d) 6nF

Easy explanation: Diffusion capacitance = \(\frac{dQ}{dV}\)

CD = \(\frac{1.2 x 10^{-8}}{2}\)

CD = 6 nF.