Re: [Discuss-gnuradio] Some USRP2 Questions

[Firas A.]

Hi Matt,

Thank you for the answers. I will try to add them to USRP2 FAQ Wiki.

One thing is not clear which is the TX path interpolation.

In RX path:

if ADC sampling = 100MHz,
and if Min decimation = 4
=> max IF bandwidth = 25MHz
=> Max IF Ethernet rate = 4 bytes per sample * 25 MSPS = 100 Mbyte/sec = 800
Mbit/sec (Every thing is clear)



But this is not clear in TX path because:

If Max IF Ethernate rate = 100 Mbyte/sec     => Max TX IF bandwidth = 25 MHz
and if min interpolation = 4 (as you said in your previous email)
=> DAC will get 100 MSPS

But USRP2 DAC is clocked at 400 MHz, so where is the other missing
interpolation by 4 in the TX chain?


Best Regards,


Firas

 
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