[USRP-users] Ettus UBX-160 vs SBX-120

Simon Olvhammar simon.olvhammar at gmail.com
Mon Jul 3 04:35:25 EDT 2017


Hi,

I am not sure if I understand correctly.
How are the ADC to slow if I use a master clock rate of 120 MHz and 
sampling rate of 120 MHz on a UBX-160? I don't need 160 MHz bandwidth 
only 120 MHz.

Regards
Simon

On 06/28/2017 04:12 PM, Sylvain Munaut wrote:
> Hi,
>
>
>> We currently running a system with a Ettus x310 and a SBX-120.
>> We also a have UBX-160 daughter board.
>>
>> For several reasons, mainly due to computer performance limitations, we can
>> only run with a complex sampling rate of 120 MHz.
>> My question is if I will see any improvement in performance, e.g. filter
>> characteristics, if I instead use the UBX-160 and run it at 120 MHz compared
>> to SBX-120 at 120 MHz or are they similar?
> You can't do that.
>
> If you have the master clock-rate at 120 MHz and use a 160 MHz wide
> daugtherboard, you will get aliasing because the ADC are too slow.
> You'd have to go to a 100 MHz samplerate for it to work. (200 MHz
> sampled by the ADC then HW decimated by 2 to 100 Msps).
>
> Cheers,
>
>     Sylvain





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