To supply a voltage line, it seems like using two capacitors as voltage divider is a good idea. It removes noise, no power is dissipated, voltage level depends on the RATIO of two capacitors. Why don't we use capacitive divider for voltage regulators?
To supply a voltage line, it seems like using two capacitors as voltage divider is a good idea. It removes noise, no power is dissipated, voltage level depends on the RATIO of two capacitors. Why don't we use capacitive divider for voltage regulators?
A capacitive divider only works (properly) when clocked,
zeroed periodically. This does consume power. Less than
a low impedance resistor divider most likely, but nonzero
and needing complexity. If you clock the feedback you
can expect to see noise from that (deterministic tones
in the output; customer must deal). You also will likely
need a high voltage capacitor - got one? - and switches
(ditto). And to make sure the switches and the driven
load do not mess up your ratio.