Lecture 3. Zener Region. As the reverse voltage increases the diode can avalanche-breakdown (zener breakdown). Zener breakdown occurs when the electric field near the junction becomes large enough to excite valence electrons directly into the conduction band and generate carriers.
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Figure 1.33Determining the ac resistance at a Q-point.
For the characteristics of Fig. 1.34:
Figure 1.35 determining the average ac resistance between indicated limit