Hi

Maxim has a video DA.  The data sheet shows the internal schematic. Check at
http://pdfserv.maxim-ic.com/arpdf/MAX4135-MAX4136.pdf
It should give you some idea of how it is all done, basically you need to
buffer the input then use the output of the buffer amp to drive the rest of
the amps.
Dave

> if you look at the page that Dave Mumert sent at:
> http://www.geocities.com/IECMaster/circuits1/cir_rfv030.html
>
> My question refer to the input of the opamp, if I connect many opamps to
one
> source with so many resistors on the input, shouldn't it effect the source
> signal power? maybe I'll need to amplify the initial signal source? so
each
> opamp get it's "standard" signal power.
>
> hope that everybody understand what i write.

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