Discussion
What is the chief limitation of a voltage multiplier?
Answer: D
Multipliers have high source impedance, so the output falls markedly as soon as current is drawn - which is why they suit high-voltage, low-current duties like photomultiplier supplies. The peak inverse voltage per diode stays modest, the ripple frequency is not reduced, and they work perfectly well at high frequencies, which is why switching supplies use them. A topology that trades regulation for voltage is fine wherever the load is light and steady. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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