Important contributions on multi-phase charge pumps of Starzyk et al posed a question about a maximum voltage gain in a circuit containing k capacitors. We comment on Starzyk's conjecture of 2 k-1 gain and give general limit value theorems. We conclude that Starzykpsilas conjecture is true however, in general terms it gives a condition that is necessary but not sufficient. A note on circuit realizations is given.
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Marek S. Makowski (2008) studied this question.