Question

What is transition capacitance and diffusion capacitance?

Answer 1

Answer ...

Transition capacitance

• Occurs basically when PN junction is in reverse biased condition
• In reverse biasing situation it acts as an dielectric ..
• The junction capacitance now will be termed as Transition capacitance as PN junction now acts as a parallel plate capacitor..

Diffusion capacitance

• When the PN junction is forward biased a capacitance larger than transition capacitance comes into play and that's the diffusion capacitance!!
• Diffusion capacitance occurs in a forward biased p-n junction diode.
• Can be termed as strong capacitance too...

.........The main point of different..........

1. Diffusion capacitance occurs at forward bias condition
2. Transition capacitance can be seen in reversed bias ...