Discussion
Why is a small-signal diode's dynamic resistance inversely proportional to its current?
Answer: B
Differentiating the diode equation gives a slope resistance of the thermal voltage divided by the current, so at one milliamp it is about 26 ohms and at ten it is about 2.6. Bulk resistance, capacitance and stored charge are all real effects but none produces this relation. A current-controlled resistance falling as one over the current is what makes diodes and transistor junctions useful as variable elements, and the same expression reappears throughout small-signal analysis.
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