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R&S SML01 1.1Ghz Generator
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nctnico:

--- Quote from: rsjsouza on July 22, 2023, 02:10:25 pm ---For cost reasons at the lab we usually don't calibrate or rely on a signal generator amplitude accuracy - instead, we have calibrated SAs to verify and eventually normalize the output of any signal generator. Although a bit more cumbersome as it involves an additional verification step, it tends to work well. And this is true even for the SMIQs we have around.

--- End quote ---
That is also a good way. You can load calibration tables into the SMIQ for this purpose (and automate the process if you want) but my guess is that this is more to compensate for dampening from cables rather than improving output accuracy. The SMIQ is specified for 0.5dB output level accuracy up to 2 GHz which is pretty good.
Martin72:
Hi,

OK, the Aim tti is "dead", then I´ve looked for some else cheap and spacesaving generators, but no way... ;)

First this cought my attention because of the claimed 0.5dB precision:

https://eleshop.de/rf-explorer-signal-generator.html

But in the specs it will be relative :

https://static.eleshop.nl/mage/media/downloads/RFExplorer-6G_Signal_Generator_datasheet.pdf

This one here(german language):
https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_common_library/dl_news_from_rs/165/165_sml_de.pdf

Sounds promising, it´s not too big and you can get it used for under 1000 bucks.
G0HZU:
To do this properly, you have to minimise all contributors to uncertainty. The classic way to do this would be to use a self levelling system as drawn below. The level accuracy of the sig gen is improved to be similar to the accuracy of the power meter and as long as the splitter is connected directly at the input of the scope, there are no cable losses to worry about.

The other major contributor to uncertainty is due to mismatch from the sig gen mating to the device under test. With the system below, the source VSWR is defined 'only' by the quality of the 50 ohm resistor in the splitter that feeds the device under test. So as long as a precision splitter is used, you can get ultra low source VSWR at 1GHz for very little cost. The splitter can be homebrew. This reduces mismatch uncertainty to negligible levels.

The sig gen either has to have the option for external ALC or it must have external AM that is DC coupled and this allows an external leveller amp to be used.

I'm not suggesting you go out and buy a 83752A sweeper or an expensive power meter or HP 11667 splitter, but this system represents the ideal way to do this test.

You can make the splitter for a very low cost using a pair of 50 ohm resistors (Hint: use two 100R SMD resistors in parallel for each 50R resistor), and any mid range 1GHz sig gen that supports EXT AM with DC coupling can be used. The power meter could be replaced with a decent diode detector as long as the sig gen has low harmonic content. This would save even more cost. It's still going to be way better than anything else suggested so far.



Bud:
Have you considered using a pulse gen and derive the DUT scope bandwidth from rise time?
Martin72:
Hi,

Yes....

https://www.eevblog.com/forum/testgear/math-problems-on-sds2k-(trying-to-display-bandwith)/msg4972270/#msg4972270
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