### ELE533 Bipolar Devices

Mid Term Exam

July 9, 1998

Question 2 Answer

Consider a *pn* junction with the P side doped with
Na = 10^{20} cm^{-3}

Approximately, what is the required doping on the N side to obtain a breakdown of 20V?
Use the one sided step junction approximation.

**
Answer N**_{D} = 1.4X10^{16}cm^{-3}

**
**