Products > Test Equipment
Siglent SSG3000X and SSG5000X series RF Signal generators
2N3055:
--- Quote from: markus_jlrb on August 11, 2024, 08:08:49 pm ---@TurboTom,
according to the UI, an external IQ signal could be enabled in the SSG3kX.
That's what confusing me. But on the other hand no external IQ Input BNC
are available, but the case is already prepared for this purpose.
Btw the UM claim that external IQ modulation via a SDG6kX is possible, but
Siglent support decline this statement written in the manual.
Markus
--- End quote ---
Please find attached the very User Manual.
Page 74:
2.8 I/Q Modulation
I/Q modulation, i.e. two orthogonal signals (carriers with the same frequency, phase
difference of 90°, generally expressed by Sin and Cos) and I (In-Phase, in-phase
component) and Q (Quadrature Phase) signals are respectively modulated by carrier and
transmitted together, thereby improving spectrum utilization.
Note: Only some models are equipped with IQ modulation function. For specific models,
please refer to the SSG3000X data sheet.
User Manual is for both I/Q model and the basic model without I/Q module.
Data sheet also plainly says there are two models..
Nokia6681:
If this option was not ordered when you purchased it, the device does not have it and cannot be selected on the front of the display. My device does not have this function, if I had wanted it I would have had to order it with an additional payment when purchasing it.
I don't think Siglent offers to buy these separately because the firmware software also needs to be expanded.
TurboTom:
The generator probably also needs to undergo an extended calibration since the I/Q modulator has to operate over the full bandwidth of the instrument. Thats one of the disadvantages of the "direct frequency generation" approach.
Other instruments like the R&S SM300 feature a frequency mixing approach to generate the desired output. There, the I/Q modulation is much easier since it can be applied to the "fixed frequency" mixer input. Moreover, wide frequency sweeps are possible. The advantage of the "direct" approach is that it's way less difficult to generate very low phase noise signals. So, both methods have their pros and cons.
markus_jlrb:
@TurboTom,
thanks for explanation - I was not aware of this concept Siglent is using inside the SSG3kX device.
--- Quote ---Other instruments like the R&S SM300 feature a frequency mixing approach to generate the desired output. There, the I/Q modulation is much easier since it can be applied to the "fixed frequency" mixer input. Moreover, wide frequency sweeps are possible. The advantage of the "direct" approach is that it's way less difficult to generate very low phase noise signals. So, both methods have their pros and cons.
--- End quote ---
Due to the fact that internally we have two ports on the main PCB for I/Q I was convinced that there must by a
mixer present to modulate the carrier with the fed in I/Q signal.
But when the mixing is done inside the FPGA you are right that my request could not be fulfilled.
Nevertheless I'm keen to check what will happen if I provide a small I/Q signal to the both internal ports.
Have to wait until my grantee for my device is expired and will explore in this time the opportunity to
get an I/Q module from Siglent repair support team in Germany.
Will report my findings as soon I get a proper hint on this topic.
Markus
Nokia6681:
I don't think that will help you at all because you can't select anything in this menu. Software nor ready for this.
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