Discussion
Why is a 5.6 volt Zener often chosen as a reference?
Answer: D
At about that voltage the negative coefficient of the Zener mechanism and the positive one of avalanche cancel, giving a reference that barely drifts with temperature. Dynamic resistance is lowest around six or seven volts, power depends on the current chosen, and the series resistor follows from the input voltage. A parameter that passes through zero where two mechanisms cross over is worth exploiting, and reference diodes are the clearest example. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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