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Siglent SDG6000X series 200-500 MHz AWG's

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Detlev:
If they differ from your KS measurements, how would you rate that? Good, bad, or just different? I find such discussions very interesting.

The FPL1000 has a phase noise of -105dBc (-108dBc typ.) at 1GHz/10kHz. At 1Mhz/100Hz it is better at -124dBc and at 1MHz/1kHz at around -132dBc. That's why I made my measurement at 1MHz.

At 10MHz and 100Hz offset it should be around -115 to -120dBc, that can only be estimated from the data sheet. These are values from the data sheet and are therefore better than the Siglent SAs.

Don't confuse the FPL1000 with the FPC1500, which has already been discussed here in the forum. I would also like an even better phase noise, but I didn't want to sell my house for an SA :)

I personally think the SDG6022X is very good for the price. A comparison with KS using specific examples would be nice.

Best regards
Detlev

hpw:

--- Quote from: Detlev on April 08, 2023, 03:26:52 pm ---If they differ from your KS measurements, how would you rate that? Good, bad, or just different? I find such discussions very interesting.

A comparison with KS using specific examples would be nice.

--- End quote ---

As it gets now, any different  :palm:

So first to do the homework with math and see about the beef... as looking about a dog  :-DD

As with egg and hen questions, as some did forget the rooster as only with them gets any valued eggs.

Hp

2N3055:

--- Quote from: hpw on April 08, 2023, 02:41:04 pm ---
--- Quote from: Detlev on April 08, 2023, 09:24:59 am ---You can also do this with the SSA2K plus, then we would have a comparison between the SDG6022X with the R&S FPL and the SDG2000X and the SSA2K plus.

What is wrong with the modulation for you, do you have concrete examples of what you would expect? Maybe it's me that I just don't understand you :)

Greetings and Happy Easter
Detlev

--- End quote ---

Look, I did many measurements using SSA2K Plus and SDG2K and a KS AWG. Also source from 10MHz Sine OXCO as -120dbc@1Hz. Complained Siglent about false Square wave FM & PM. At the end even the new FM & PM is in questions. So I asked for your SDG6K figures and they differ from my KS measurements.

The basic question is how the made the Square wave ... by math or using a sine to square wave circuit.

In addition the performance of the SSA is important, as low PN & Jitter & close-in noise & other spurs & low over all noise contributions.

I come now to the conclusions about the FM / PM as sine & square waves, just at first, to simulate various with high floating point precision as may the precision on the HW gear is may the limited factor.

My 2 cents

Hp

--- End quote ---

Again you are on your crusade to prove something (which is ok as a principle) but nobody understands what exactly you are trying to say.
Sorry, I'm just being honest and a bit direct.

As to answer to one of your questions I understand, both Keysight you are mentioning and Siglent AWG in question are AWG: Arbitrary waveform generators, that numerically construct signals from clocked digital values through ADC   DAC  to output amplifier. They are not modulated physical sources (like VCOs, disciplined or not) or pulse forming sources that form output signals through physical pulse forming networks...

2N3055:

--- Quote from: hpw on April 08, 2023, 04:38:01 pm ---
--- Quote from: Detlev on April 08, 2023, 03:26:52 pm ---If they differ from your KS measurements, how would you rate that? Good, bad, or just different? I find such discussions very interesting.

A comparison with KS using specific examples would be nice.

--- End quote ---

As it gets now, any different  :palm:

So first to do the homework with math and see about the beef... as looking about a dog  :-DD

As with egg and hen questions, as some did forget the rooster as only with them gets any valued eggs.

Hp

--- End quote ---

I don't get the whole animal farm thing... :-//

hpw:

--- Quote from: 2N3055 on April 08, 2023, 05:06:10 pm ---Again you are on your crusade to prove something (which is ok as a principle) but nobody understands what exactly you are trying to say.
Sorry, I'm just being honest and a bit direct.

As to answer to one of your questions I understand, both Keysight you are mentioning and Siglent AWG in question are AWG: Arbitrary waveform generators, that numerically construct signals from clocked digital values through ADC to output amplifier. They are not modulated physical sources (like VCOs, disciplined or not) or pulse forming sources that form output signals through physical pulse forming networks...

--- End quote ---

You mean DAC or not?

1) The AWG needs some math functions to fill up the internal buffer based on the user setup.
   Than this buffer is played in a cycle. Or they calculate the sample word on runtime, but I guess not.

2) How they build the FM/PM is for me unknown. As for sine, there exit clear math formulas.

3) For the square wave FM/PM the formulas are currently unknown to me. Or they use Sine FM/PM modulation and than convert to Square wave using any converter.

4) To compare each gear ends in a disaster...

5) better is to simulate first and compare the results (= the reference) with the various gear.

my 2 cents

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