[USRP-users] Sampling ADC/DAC at a different sampling rate compared to the FPGA-host data rate

Karan Suri youngsuri at gmail.com
Fri Jul 21 18:00:19 EDT 2017

Hi Marcus,
I am using an X310 model to implement loopback at 100MHz sampling rate. But
I can't use a 10G ethernet cable. But at the same time , i really get good
control on the rate of ADC/DAC irrespective of the data link speed ,
because i am not writing to or receiving from a file. Please help.
Karan Suri
University of Michigan

On Jul 21, 2017 11:52 AM, "Marcus Müller via USRP-users" <
usrp-users at lists.ettus.com> wrote:

> Hi Karan,
> what USRP model are we talking about?
> Best regards,
> Marcus
> On 20.07.2017 07:51, Karan Suri via USRP-users wrote:
> Hello USRP Users
> I was able to develop an *FPGA based loop back which directs the raw ADC
> data to the DAC* . The TX transmits whatever it sees on the receive
> signal path.
> The loop back works as expected for sampling rates upto 30 MSps but it
> fails to loopback received signals at a *higher sampling rate (>40)*. It
> gives the potential "uuuuuuuuu..." problem or the *underflow* issue. I
> suspect this issue because of the 1G Ethernet cable which limits the
> maximum data rate.
> But since* I am really not sending any data into the host* I should
> essentially be able to use any sampling rates upto the maximum ADC sampling
> limits, irrespective of the FPGA to the host data rates.
> Is there any way I can achieve a different sampling rates for the ADC-DAC
> versus the FPGA-Host? Like making the ADC /DAC sampling rate be
> *independent* of the Host FPGA link speed? I have to achieve a *100 MSps
> sampling speed with a 1 G Ethernet card*
> Any suggestions will be highly appreciated.
> Thanks in anticipation
> Karan Suri
> University of Michigan
> Research Scholar
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