Dear Pablo,
welcome to the usrp-users community! Let's quickly answer your questions
in-text:
On 19.10.23 12:03, Mico-Soler Pablo via USRP-users wrote:
Regarding X440, ETTUS USRP X440 (8 TX AND 8 RX, 1.6 GHZ BW, 30 MHZ TO 4 GHZ
SDR, GPSDO):
1. If each channel has a bandwidth up 1.6GHz, why the total instantaneous
bandwidth is
3.2GHz if it has 8 channels (1.6GHz*8channels > 3.2GHz)?
The digital architecture just doesn't allow us to do that. The accumulated internal data
rate becomes challenging. (Just to illustrate: 1.6 GS/s · 8 = 12.8 GS/s, at 16 bit per I
and Q, so 32 bit per sample, that'd be 409.6 Gbit/s; you couldn't even get that into or
out of the device using the interfaces supplied)
1. Regarding “/IF-Bandwidth combination limitations apply due to Nyquist zones
and gaps”/,
1. If we tune CH1 at 830MHz, are we going to be able to detect all the
spectrum
from 30-1630MHz?
Yes, but beware that you need to supply your own front-end with the X440! Otherwise,
you'll observe 30–1630 MHz, superimposed with what's 1630–3230 MHz and up until the (not
extremely sharp) ca 4GHz cut off, what's in 3230–4830 MHz, too.
1. If we tune CH2 at 2430MHz, are we going to be able to detect all the
spectrum
from 1630-3230MHz?
2. If we tune CH3 at 4000MHz, are we going to be able to detect all the
spectrum
from 3230-4000MHz?
Yes! Remember, though, that you're seeing all these bands as aliased into baseband (see
above), so you need to sufficiently filter your analog signal, and that will have some
transition bandwidth.
1. Which the real maximum channel BW?
1600 MHz
Is it possible to decrease the minimum frequency down to 20MHz?
We don't have measurements for that. The analog signal processing of what is fed into the
ADCs has a lower cutoff, and we qualified the product down to 30 MHz, not 20 MHz. That
doesn't mean you won't see what's at 20 MHz, but that we can't make any guarantees about that.
Also, broadband matching is hard, so I'd confer with whatever team supplies that input on
how far down they really need to go.
1. Is it possible to increase the maximum frequency up to 6GHz?
Same answer as above.
Could you provide the USRP X440 datasheet to see their RF/Digital performance
parameters?
https://www.ni.com/docs/de-DE/bundle/ettus-usrp-x440-specs/page/specs.html
Regarding X410, ETTUS USRP X410 (4 TX/RX Channels, 400 MHz BW, Zynq US+
RFSoC ZU28DR)
7. Is it possible to configure RX0 as an extra receiver channel, so instead of
having 4
receiving channels [RF0 (RX1), RF1 (RX1)] & [RF0 (RX1), RF1 (RX1)] (Fig 1),
we could
have 8 receiving channels (Fig 2)?
Not really, no. https://files.ettus.com/manual/page_zbx.html Not enough ADCs!
If previous question is not possible, do you have in your roadmap to develop an X410
version with 8 channels?
I'll have to pass on that, as product strategy isn't what I'm involved with. You'd
probably be better served with 2× X410, from a computational point of view, probably.
Best regards,
Marcus
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