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| Two Tone Test with Scope and SA |
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| G0HZU:
Thanks! I was kind of expecting a digital IF with fewer bits but with a higher sampling frequency and wider bandwidth. If it has a narrowband digital IF with 18 bits I would have expected it to perform really well even with close tone spacing. I've not played with an R&S FSIQ analyser so I can't really be sure what to expect from it. --- Quote ---Not entirely sure, but maybe with some more effort one could make better measurements also at 1 kHz spacing. --- End quote --- I agree. It might be worth doing a few more experiments to explore its limits. |
| rf-messkopf:
--- Quote from: G0HZU on June 21, 2022, 09:43:40 am ---Thanks! I was kind of expecting a digital IF with fewer bits but with a higher sampling frequency and wider bandwidth. If it has a narrowband digital IF with 18 bits I would have expected it to perform really well even with close tone spacing. I've not played with an R&S FSIQ analyser so I can't really be sure what to expect from it. --- End quote --- At least that's what I gather from the service manual I have. I would have to check if the assembly part numbers match, maybe there were changes down the line. Also there may be differences between the FSEA/FSE and FSIQ units in this regard. R&S was never generous in terms of service manuals, and full schematics were not released. If I remember correctly, the digital IQ demodulator is a completely separate unit with its own ADC and DSP, but offhand I'm not sure. I'm also not sure about the effective analog bandwidth of the digital IF. According to the assembly block diagrams and the wiring diagram, the analog RBW filter section is ahead of the digital IF assembly and the ADC. No idea what the actual bandwidth it uses is. Unless someone can dig out some documents that describe it, one would have to do some reverse engineering. --- Quote from: G0HZU on June 21, 2022, 09:43:40 am ---I agree. It might be worth doing a few more experiments to explore its limits. --- End quote --- I'll see what I can do. |
| gf:
I stumbled across this paper which I found very interesting: https://www.researchgate.net/publication/261321090_Low-IMD_two-tone_signal_generation_for_ADC_testing |
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