Question

Diffusion capacitance is larger than transition capacitance.

(a) True

(b) False

(c) Both are same

(d) Depends on doping concentrations

This question was posed to me at a job interview.

My enquiry is from Diffusion Capacitance in chapter Diode Circuit of Analog Circuits

Answer 1

Right option is (b) False

For explanation I would say: Diffusion capacitance occurs in a forward biased diode, transition capacitance is easy to see in reverse bias. CD > CT for a forward bias junction. In reverse bias though, CD may be neglected compared to CT.