Discussion
What does the piecewise-linear model add to the ideal model?
Answer: B
It adds a constant forward drop, typically 0.7 V for silicon and 0.3 V for germanium, and often a small series resistance as well. The temperature coefficient, the exponential law and reverse breakdown are all refinements beyond it. The model is the workhorse of hand analysis because it turns a non-linear device into a battery and a switch, which any linear method can then handle.
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