ELE533 Bipolar Devices

Mid Term Exam
October 25, 2005

    Figure 3

  1. Consider the nn+ junction shown in Figure 3. (This represents the epi-buried layer junction.) The n type epi is doped with ND = 5 X 1015 donors/cm3. The doping level in the n+ buried layer is 1017 donors/cm3.

  2. What is the equilibrium voltage of the EPI relative to the burried layer?