Hi,
Now you repeated what we already knew.
But we don't know:
* frequency, input waveform, output waveform, expected reaction time, max ripple ...
* what's your application
* whether you want peak detection or averaging
Don't get me wrong, I don't expect that you have fully developed the complete application. But for me the informations are rather vague.
***
You say you want stability. Now it can be regulation loop stability, or long time stability, or temperature stability..
Klaus