Discussion
What is the practical consequence of a diode's exponential characteristic for measurement?
Answer: A
Because sixty millivolts changes the current tenfold, setting a diode's current by applying a voltage is hopelessly imprecise, and the current must be set by a series element. The forward drop is easy to measure at a known current, leakage is measurable with care, and frequency is a separate matter. Every device with an exponential characteristic is driven from a current rather than a voltage for exactly this reason, which is why the same arrangement appears with light emitting diodes and transistor base junctions.
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