Author Topic: Siglent SSG3000X series RF Signal generators  (Read 4263 times)

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Online nctnico

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Re: Siglent SSG3000X series RF Signal generators
« Reply #25 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.
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Offline tautech

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Re: Siglent SSG3000X series RF Signal generators
« Reply #26 on: August 26, 2019, 12:41:08 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.
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.
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Online nctnico

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Re: Siglent SSG3000X series RF Signal generators
« Reply #27 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.
« Last Edit: August 26, 2019, 12:45:55 pm by nctnico »
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Offline tautech

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Re: Siglent SSG3000X series RF Signal generators
« Reply #28 on: August 26, 2019, 12:51:53 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.
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
« Last Edit: August 26, 2019, 01:21:08 pm by tautech »
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Offline TheUnnamedNewbie

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Re: Siglent SSG3000X series RF Signal generators
« Reply #29 on: August 27, 2019, 10:34:56 am »

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.

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.



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


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.
« Last Edit: August 27, 2019, 10:37:08 am by TheUnnamedNewbie »
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Online nctnico

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Re: Siglent SSG3000X series RF Signal generators
« Reply #30 on: August 27, 2019, 11:09:35 am »

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.
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.
Not extremely fast. It is for a very basic proof of concept.
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Offline 2N3055

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Re: Siglent SSG3000X series RF Signal generators
« Reply #31 on: August 27, 2019, 11:51:04 am »

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.
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.
Not extremely fast. It is for a very basic proof of concept.

What carrier frequency you need? With Siglent SD6000X  you can combine channels in gen and get everything right from the gen if 200, 350 or 500 MHz carrier is good enough. Also you can get I/Q modulator as separate component and feed it I/Q from SDG6000X and carrier from LO, that can be whatever you have....
 

Online nctnico

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Re: Siglent SSG3000X series RF Signal generators
« Reply #32 on: August 27, 2019, 11:52:54 am »
Unfortunately the carrier needs to be much higher in the 800MHz to 1GHz range (can't go into specifics). Also the experiences of Turbotom with the SDG6000 are not giving me a warm & fuzzy feeling. Right now I'm thinking an SDG2000 and a used RF generator with IQ modulator should be able to do it. From there I expect the project to move to a real radio transmitter quickly so it doesn't make sense to invest a whole lot in getting IQ modulated signals from a test setup.
« Last Edit: August 27, 2019, 12:00:09 pm by nctnico »
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Offline 2N3055

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Re: Siglent SSG3000X series RF Signal generators
« Reply #33 on: August 27, 2019, 12:31:50 pm »
Unfortunately the carrier needs to be much higher in the 800MHz to 1GHz range (can't go into specifics). Also the experiences of Turbotom with the SDG6000 are not giving me a warm & fuzzy feeling. Right now I'm thinking an SDG2000 and a used RF generator with IQ modulator should be able to do it. From there I expect the project to move to a real radio transmitter quickly so it doesn't make sense to invest a whole lot in getting IQ modulated signals from a test setup.
Fair enough..

If it means anything to you,most of the bugs initially found are fixed, U/I had some improvements, I/Q was also improved. Most of the problems are with fast pulses, AWG and I/Q seems OK.
If you want, I can run a specific test to see if that works.  Just send me PM.

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Online nctnico

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Re: Siglent SSG3000X series RF Signal generators
« Reply #34 on: August 27, 2019, 12:32:54 pm »
Unfortunately the carrier needs to be much higher in the 800MHz to 1GHz range (can't go into specifics). Also the experiences of Turbotom with the SDG6000 are not giving me a warm & fuzzy feeling. Right now I'm thinking an SDG2000 and a used RF generator with IQ modulator should be able to do it. From there I expect the project to move to a real radio transmitter quickly so it doesn't make sense to invest a whole lot in getting IQ modulated signals from a test setup.
Fair enough..

If it means anything to you,most of the bugs initially found are fixed, U/I had some improvements, I/Q was also improved. Most of the problems are with fast pulses, AWG and I/Q seems OK.
If you want, I can run a specific test to see if that works.  Just send me PM.
Thank you. I'll keep that in mind.  :-+
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 
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Offline Howardlong

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Re: Siglent SSG3000X series RF Signal generators
« Reply #35 on: August 27, 2019, 01:24:15 pm »
For a POC, you could use an eval board: I've used the ADRF6755 eval board with its partner USB/SPI interface with its software front end. If you're brave you can puch the SPI interface yourself, although it depends how much you value your time second guessing against purchasing the $49 USB partner board.

This includes combined LO and IQ mixer for upconversion/modulation, and will generate a carrier from 100MHz to 2.4GHz, with ~8dBm P1dB. Baseband bandwidth 600MHz, if you can find an application that needs it!

It was about three years ago I last used one, and the underlying parts did find their way onto a real product. There may be more modern equivalents.

« Last Edit: August 27, 2019, 01:26:14 pm by Howardlong »
 

Offline TurboTom

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Re: Siglent SSG3000X series RF Signal generators
« Reply #36 on: August 27, 2019, 03:49:45 pm »
The ADALM-Pluto could also be a low-cost option, especially since already some software solutions are available that may suit your specific requirements.
 


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