[sdiy] fanning grounds vs. dirty/clean ground

Theo t.hogers at home.nl
Wed Aug 21 05:19:32 CEST 2002

Ok thanks I get it.
This it the same as you do for ideal diode circuits.
Guess the calculations are similar too.


From: jhaible <jhaible at debitel.net>

> > > * use two separate feedback paths (needs some calculation).
> > >
> > Don't get that last one, how two separate feedback paths and perhaps
> > interesting what calculations?
> This is hard to explain with a few words. Anybody got a link for that?
> It should be in most old opamp data books ...
> You have a series resistor between the opamp output and your (capacitive)
> load, and one feedback (resistor) goes from _after_the series resistor
> to the negative opamp input, and a second feedback (capacitor) goes from
> _before_ the series resitor to the negative opamp input. I have never
> *calculated* these values - I just optimize them in PSpice for a specific
> application.
> JH.

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