Question

Consider a step graded diode, which has built in voltage 0.7V, and depletion width 2μm. Depletion width is W2 when a reverse bias voltage of 11.3 V is applied. Find W2?

(a) 8.28μm

(b) 8μm

(c) 4.14 μm

(d) 9.88 μm

I got this question during a job interview.

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

Answer 1

The correct option is (a) 8.28μm

For explanation I would say: \(\frac{W1}{W2} = \sqrt{\frac{V1}{V2}} = \sqrt{\frac{0.7}{12}}\)

W2 = 4.14*2 = 8.28μm.