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Bode plot up to a few 100 MHz
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Martinn:

--- Quote from: dophuc on October 04, 2023, 03:13:08 am ---
--- Quote from: tautech on October 04, 2023, 02:45:11 am ---
--- Quote from: dophuc on October 04, 2023, 02:21:35 am ---In the Rigol DHO800 Review Video "EEVblog 1566 - Rigol DHO800 12 Bit Oscilloscope" at minute 54:58, I see Dave using the Rohde & Schwarz MXO4 Series to evaluate the Bode Plot measuring probe with integrated 100Mhz waveform generator. That machine is the dream of many people because of its price when purchased with the "100 MHz waveform generator" option  ;D

--- End quote ---
200 MHz model = € 8,280  :o
https://www.batronix.com/shop/oscilloscopes/Rohde-Schwarz-MXO44-242.html

--- End quote ---

This price does not include the "Waveform generator" and "Bode Plot" options, adding these 2 options costs about €3400 excluding tax  ;D

--- End quote ---
I recently purchased a R&S 300 MHz RTB2k "fully loaded" (with good discount - certainly being helped by some friendly competition from the eastern part of the world), so I am not quite looking for upgrading this.
tautech:

--- Quote from: Martinn on October 04, 2023, 07:01:50 am ---If you know of a RF signal generator with sine output and programmable attenuator for < $2000, let me know.

--- End quote ---
As Mike pointed to earlier SDG6000X and entry into this range is 200 MHz model but can be coaxed to 500 MHz.
Then with your DSO old school Bode plot to 300 MHz would be very possible like Dave shows in this old video:
Martinn:

--- Quote from: mawyatt on October 03, 2023, 09:37:54 pm ---The OP mentioned scope and DAQ front ends, which might imply high impedance. Here's where the DSO and AWG might be a better choice that a VNA, which usually are centered around low Z of 50 ohms.

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Yes, I am thinking more of high impedance amplifiers, like this small design: https://www.eevblog.com/forum/projects/measuring-switch-mode-supply-noise-hp461a-replacement-ada4895/msg4652395/#msg4652395
But where do you see the problem with 50 ohms? High Z input can be terminated with 50 ohms (input noise changes of course, but that's not relevant here). Output needs to be capable of driving a 50 ohms load, which might be more of a problem. I had to include cable drivers in my "HP461A" LNA design.


--- Quote from: tautech on October 03, 2023, 10:29:52 pm ---I imagine beyond 120 MHz with a HiZ system good results might be difficult to obtain and much less so for a proper 50 Ohm impedance matched arrangement.

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I agree, that's what I wrote "few 100 MHz", which I think should be achievable with proper layout.


--- Quote from: tautech on October 03, 2023, 04:25:01 pm ---Is 120 MHz enough ?
SDS2202X-E with SDG2122X.

To 1.5 GHz, SVA1015X Plus.

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Interesting options. As I wrote I just bought my RTB2K and certainly will not replace that. SDG2122X: Nice, but a bit limited at 120 MHz.
What about the SDG6022X: Can it be "upgraded" to 350 or 500 MHz as well? EDIT answered by tautech

SVA1015X lists "discontinued" at Batronix. Tons of other options though:
https://www.batronix.com/shop/siglent/all-spectrumanalyzer.html
However usable are VNA functions in these "classical" SA?
Also, I own already a HMS1000 spectrum analyzer (no TG) I purchased for EMC precompliance, would need to get rid of that first (market value probably near zero due to Chinese competition and lack of magic R&S label).
Martinn:

--- Quote from: tautech on October 04, 2023, 07:20:47 am ---As Mike pointed to earlier SDG6000X and entry into this range is 200 MHz model but can be coaxed to 500 MHz.
Then with your DSO old school Bode plot to 300 MHz would be very possible like Dave shows in this old video:

--- End quote ---
I also considered signal generator+DSO, but instead of the crude sweep method Dave shows I thought of running a sweep via remote SCPI control. Set frequency, acquire reference and output channels, calculate amplitude/phase, next frequency. But that would be a lot of work to do the interfacing and the basic sweep method might be good enough!

I will definitely look into the SDG6000X!
tautech:

--- Quote from: Martinn on October 04, 2023, 07:24:01 am ---SVA1015X lists "discontinued" at Batronix. Tons of other options though:
https://www.batronix.com/shop/siglent/all-spectrumanalyzer.html
--- End quote ---
:-//  It's a current model:
https://www.batronix.com/shop/spectrum-analyzer/Siglent-SVA1015X-VNA.html


--- Quote ---However usable are VNA functions in these "classical" SA?
--- End quote ---
Same HW as SSA3015X Plus.  ;)
SVA1000X models have a # of modes with SA and single active port VNA being core functions that provide for a range of S11 and S21 measurements. Optional but 120hrs of trial use are DTF and EMI modes.
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