[Xylo-SDR] A/D anti-aliasing filters

["Arthur J. Lekstutis" <Artie@Lekstutis.com>]

I clearly understand the need for anti-aliasing filters on an A/D 
converter, but with some devices it's a little less clear to me how much 
is actually needed.

Specifically: the TI / Burr Brown PCM1804 has a built in "linear phase 
antialias digital filter" that is fairly sharp and very deep. Does it 
require any additional filtering when connected to the capacitors of a 
quadrature sampling detector, like on Flex Radio? It almost seems like 
it will do more harm than good. Does anyone have practical experience on 
this?

Thanks!

Later,
Artie Lekstutis
KC2MFS