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| Siglent SSG3000X and SSG5000X series RF Signal generators |
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| nctnico:
AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too. |
| tautech:
--- Quote from: nctnico on August 26, 2019, 12:35:49 pm ---AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too. --- End quote --- Yep, in the absence of the internal SDG3kX IQ HW option they do this: Defpom lifted the lid on mine in the vid linked on the previous page but the IQ HW is not installed in the base models. |
| nctnico:
That solution is getting rather expensive and as usual I'm wary of bugs especially when it comes to equipment which serve a niche market. I really need to propose a tried & tested solution so I'm still hoping someone with hands-on experience generating IQ modulated signals can chime in. |
| tautech:
--- Quote from: nctnico on August 26, 2019, 12:42:47 pm ---That solution is getting rather expensive and as usual I'm wary of bugs especially when it comes to equipment which serve a niche market. I really need to propose a tried & tested solution so I'm still hoping someone with hands-on experience generating IQ modulated signals can chime in. --- End quote --- Sure I get that but do the sums vs SSG plus IQ and then compare what you have for the outlay, a SSG that can be improved ;) plus a well featured 16 bit AWG that can also be improved. ;) Like I mentioned, jump over to the SDG6kX thread and see who's using IQ in them. Further info, it seems you need a PC connected to SDG6kX to do IQ. http://siglentna.com/wp-content/uploads/dlm_uploads/2017/12/SDG6000X_UserManual_UM0206X-E01A.pdf P65/198 2.3 To Set IQ Waveform (Optional) The SDG6000X can be used as an IQ waveform generator, providing ASK, PSK, QAM, FSK, MSK and multi-tone signals. The EasyIQ software is necessary when using SDG6000X to generate an IQ waveform. The EasyIQ is a PC program used to download IQ baseband waveform data to the SDG6000X through a USB or LAN device interface. EasyIQ PC program is free for download from the SDG6kX Software page on Siglent websites: https://siglentna.com/service-and-support/firmware-software/waveform-generators/#sdg6000x-series |
| TheUnnamedNewbie:
--- Quote from: nctnico on August 26, 2019, 12:35:49 pm ---AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too. --- End quote --- Depends on how fast your IQ has to go, and how fast your AWG is. You can have an AWG output an IQ signal around a non-DC carrier, and then mix it in a simple AM-modulation signal generator. --- Quote from: tautech on August 26, 2019, 12:51:53 pm --- Further info, it seems you need a PC connected to SDG6kX to do IQ. http://siglentna.com/wp-content/uploads/dlm_uploads/2017/12/SDG6000X_UserManual_UM0206X-E01A.pdf P65/198 --- End quote --- That is a real downer. There are some basic things which a generator such as this should be able to generate built-in (basic QAM/QPSK/OOK/etc modulations with simple PRBS lengths, for instance). I use these types of measurements a lot, and needing to get out a computer everytime would be somewhat annoying. |
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