3 ms·
> The ADI9801 and the Xilinx RF-SOC are multi-gigasample per second converters and so you can (in theory) just grab all the spectrum and then pull out any signa
by aidenn0 4y ago
> The ADI9801 and the Xilinx RF-SOC are multi-gigasample per second converters and so you can (in theory) just grab all the spectrum and then pull out any signals you want with DSP. Works great on paper but wow is it difficult to design hardware and pipelines for that stuff.
What is the dynamic range on these converters? I suspect that if you want to pull out a signal that is 120dB below the strongest signal in the spectrum, you're going to have a bad time.
- stagger87 4y ago120dB at 4GS/s no problem, spec is on the front page of the data sheet. https://www.analog.com/media/en/technical-documentation/data-sheets/ad9081.pdf https://www.analog.com/media/en/technical-documentation/data... Edit: In case you don't know what to look for, https://www.analog.com/en/technical-articles/noise-spectral-density.html https://www.analog.com/en/technical-articles/noise-spectral-...
- aidenn0 4y agoThere was a transposition in the PN in your original comment, so I couldn't find it.
- aidenn0 4y agoI am not a EE, but that's a 12 bit ADC, so if you aren't using the receive equalization feature, aren't you limited to about 72dB just due to quantization?
- stagger87 4y agoRead the linked article.
- aidenn0 4y agoThat makes sense; the total noise power is spread across the entire Nyquist bandwidth of the ADC, which is 2GHz in this case. I haven't ever worked with ADCs with such a large ratio of sampling rate to band-of-interest before, so it was mildly surprising to see 10s of dB of processing gain.
- stagger87 4y agoYep, you got it.