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Pocket-Sized 6 GHz 1 TS/s ET Scope

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KE5FX:
Nifty.  Seems like a natural for TDR applications, especially if additional input protection is provided in a later model.  Any plans for a built-in stimulus source?

SJL-Instruments:
@KE5FX Thanks!

A standalone TDR device is on the map. The architecture can be significantly simplified since you control the trigger source. Probably $1k-2k for a few-channel device.

We have limited resources, though, so our focus for now is customer/software support for the GigaWave. Our guess is that there's a broader audience for scopes than TDR. (We could be wrong, though!)

For an external stimulus source, Leo Bodnar's pulser gives essentially optimal performance per dollar.

JohnG:

--- Quote from: SJL-Instruments on January 05, 2024, 06:39:29 pm ---@John - We don't want to say much about that at the moment  :) What bandwidth did you have in mind?
Note that the 0.35/tau bandwidth for the GigaWave is usually around 10 GHz. (The datasheet "typical" 8 GHz is conservative.) The advertised 6 GHz is very conservative. Since the response is not quite Gaussian, the effective number depends on your application.

--- End quote ---

Got me, I don't really have a sound idea, other than substantially more than 6 GHz - at least 2x and probably 3x or more. I have been looking at using TDR in order to learn about and then implement better transitions for connectors (mostly SMA and MMCX), as well as improving some probing points on some of my designs. These are basically transmission line probes built into a PCB. They work surprisingly well, but I'm starting to see some higher frequency junk (at least 5-6 GHz) and I don't have a good idea how real it is and if I need to do or can do anything about it.

The circuits are power pulse circuits, so there are also resonances in the feed networks and the impedances are low due to the high currents required. I'd also like to use TDR here to see if it can help me locate problem areas with less guesswork.

It's hard for me to justify expensive equipment to my company for this because I don't know enough about this topic, and the circuits fall well outside of the usual signal-level stuff. I have a budget 6 GHz VNA now, and a decent, if rather old, 6 GHz real-time scope (SDA 6020), and it's not enough. A relatively affordable way to get to something higher BW might withstand budgetary scrutiny.

Sorry for the vague answer, but this is new territory for me.

John

points2:
Hi,
I saw your post just after you posted... I jumped on your web site...
nice !  :-+

--- Quote from: SJL-Instruments on January 05, 2024, 04:12:48 pm ---We understand this is a very niche instrument
--- End quote ---
A sampling scope from A-brand @ A-brand price is a nice market, for sure !
But at 2-3kEur, it can be a dedicated instrument, a "dead-cheap" alternative to high-end benchtop (high BW, high sampling rate).
(I think... I admit I'm a noob compared to the experts that posted earlier  :palm: )

--- Quote from: SJL-Instruments on January 05, 2024, 04:12:48 pm ---- but we hope we struck a good balance of price and capability within this niche. Curious to hear your feedback (good or bad)!

--- End quote ---
Do you plan to release a video (youtube ...) to demo the device & see how it behaves ?

joeqsmith:

--- Quote from: SJL-Instruments on January 05, 2024, 05:03:45 pm ---Yep, we already sent one to Shahriar  :)
Understandably, he has a long backlog to get through, so the video may not be out for a while.

--- End quote ---

Look forward to seeing it.

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