It seems you have not red all the message. I'm wondering if there's a way
of achieve that BELOW the 50KHz switching freq. The second part of the
question was: does anybody know the result of switching big capacitors at
lower frequencies? IE: Let's say I want to charge a huge capacitor once
and then drop with a linear regulator to the voltage I need. That would be
"clean", as there would be no ripple at all. Anyway, as the aim is to feed
a current loop circuit which is to be connected to a 12 bit ADC, the max
ripple would be 12v/4096=2mV or less. That would be "really clean", and
(grin) outstanding the medium 40mV ripple of many switching IC.

Ale

On Wed, 3 Dec 2003, Olin Lathrop wrote:

> Alessandro Queri wrote:
> > I have 5v supply (single rail, DC) and I want REALLY CLEAN +/-12v @
> > 50mA. Consider that conversion should not generate noise in 50 KHz+
> > Band AT ALL!!!
>
> This is not possible.  It is a useless specification.  Figure out how much
> you can really tollerate.  And, how clean is "really clean"?
>
>
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