We have an application where the overall accuracy of the A/D converter
is not terribly important but where we need as high a sampling rate as
we can get. To this end, we found and intend to use the 8-bit option
that allows for 8-bit I and Q signals instead of the normal 16-bit.
However, is there a similar option that allows for 4-bit I and Q
samples? Or similarly, would it be relatively easy to implement a 4-
bits per sample scheme, possibly w/ slight modifications to the USRP
firmware? Any feedback and/or advice is greatly appreciated.