Danny, I am actually using that ADC on a Roach 2 rev 2 board... but Iam using the same adc calibration for all my spectrometers.. and as I said before, for the one that planahead was not needed, the dynamic range is fine..
Regards, Raul 2014-09-16 14:13 GMT-03:00 Danny Price <[email protected]>: > Hi Raul > > As Dan mentioned, planahead shouldn't make a difference to things like > dynamic range. If you're using an ADC that interleaves several cores (eg > 5GSPS ADC), this could be something to do with poor ADC calibration. I'd > suggest looking into that as a possible cause? > > Regards > Danny > >> Raul Sapunar Opazo <mailto:[email protected]> >> September 16, 2014 at 10:21 AM >> >> Hello everyone, >> >> I used planahead to fix the timing problems of a 1.8Ghz 32k channel >> spectrometer in roach 2. I did it without troubles, using 38% of the DSP >> and less of the 50% of RAMs.. >> >> After I compiled the model with the new constrains/placement and I tested >> the bof, I found out that the numeric noise increased a lot as the power of >> the harmonics... >> >> This issue results in a big decrease of the dinamic range of the >> spectrometer in the whole BW (around 25 db against 40-45 db of a 1.8Ghz 16 >> k ch spectrometer that didn't need planahead) >> >> I encountered this problem with an 1.8GHz 8k ch aswell.. so the issue is >> not related with the increase of the number of channels.. >> >> Anyone encountered this kind of problems when using Planahead? As I >> understand planahead shouldn't change the performance because it doesn't >> make any change in the designs... >> >> Any help will be appreciated! >> >> Best Regards, >> Raul Sapunar >> >
