Author Topic: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown  (Read 20336 times)

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Offline EEVblog

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EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« on: June 22, 2016, 11:19:41 am »
A very detailed look inside the new Siglent SSA3021X 3.2GHz Spectrum Analyser.
The entire RF section is broken down and analysed in depth with a block diagram overlay.

 
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Offline jancumps

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #1 on: June 22, 2016, 11:25:18 am »
You may also have broken down youtube. There are playback errors.

The error is very representative for a teardown video error thoug.

« Last Edit: June 22, 2016, 11:29:37 am by jancumps »
 

Offline Pinkus

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #2 on: June 22, 2016, 01:41:06 pm »
Very nice. Thank you.
May I ask for some high-res photos also from TG and main processor board?
Interesting to see on the upper right sight: an SD card connector and an unpopulated FPC connector with a missing TSSPO chip. My guess: the latter could be for a planned and/or optional (though resistive) touch panel cable with touch screen controller?
Thx
« Last Edit: June 22, 2016, 02:00:58 pm by Pinkus »
 

Offline EEVblog

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #3 on: June 22, 2016, 01:47:23 pm »
May I ask for some high-res photos also from TG and main processor board?

Yes, will upload tomorrow.
 
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Offline System Error Message

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #4 on: June 22, 2016, 04:02:26 pm »
Would really like to see this in action, do you think you could do a video of it?

edit: nevermind just found it in a comparison video. Its just unboxing and teardown videos without any action have become too common.
 
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Offline retrolefty

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #5 on: June 22, 2016, 04:12:56 pm »
The teardown was great. Sure seems like a whole lot of SA for the price point. I don't need a SA but I've always dreamed of owning one.  :-+

 

Offline Laertes

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #6 on: June 22, 2016, 05:10:35 pm »
I gotta say, the format you chose for this teardown is great! It seems you took a bit of a page from Shahriars/The Signal Paths book there, with the block diagrams and the photos with overlay, each individual block explained in depth etc.
Excellent work :-+ :-+

Though I do imagine it's a lot more work than just dicking around with your pointer straight on the actual board...
 

Online tautech

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Offline G0HZU

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #8 on: June 22, 2016, 08:49:41 pm »
At 23:32 in the video the function of the first RF switch U1 is to switch in the overload dummy load R1 (via C9) if there is an overload.

i.e. if there is a large overload the analyser can simply divert the RF input to the big 49.9R resistor R1.

The input blocking cap C10 is likely to be a big value possibly as big as 1uF. This can obviously store a lot of energy (for a given charge voltage) compared to a regular RF cap down in the nF range so I would expect to see something to protect the front end from transients from this cap if DC is ever applied/removed at the analyser input. Maybe those clamping diodes help here but it's hard to see how they are configured.
« Last Edit: June 22, 2016, 08:57:20 pm by G0HZU »
 

Offline G0HZU

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #9 on: June 22, 2016, 08:56:12 pm »
The second SOT23-6 RF switch U2 at 24:06 looks like it allows an internal test signal to be switched in to the front end of the analyser. Possibly for self testing/calibration purposes. The opamp IC to the right of it is probably something to do with the RF overload detection. Possibly a crude diode detector/comparator/trip to control that first RF switch U1 that switches in the (overload) dummy load resistor R1.

The input switches U1 and U2 look quite feeble in the SOT23-6 package but they are probably rated to about 1W and probably a bit more before they actually get damaged. So U1 can probably dump something in the ballpark of 1W into R1 if there is a bad overload. But much more than this and something is going to release some magic smoke somewhere...
« Last Edit: June 22, 2016, 09:09:31 pm by G0HZU »
 

Offline altaic

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #10 on: June 22, 2016, 09:09:07 pm »
Dave, I really liked the front-end breakdown and explanation of the block diagram! :-+

As people mentioned in the thread for the previous video, it'd be great to have a fundamentals friday explaining how SAs work and what each stage of the front-end does to the input signal to do the business. Actually, a video series on analog front-ends in general would be awesome-- you've already done one on multimeters; 'scopes and SAs to come? ;)
 

Offline AF6LJ

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #11 on: June 22, 2016, 09:17:49 pm »
By the way Dave;
The common way to pick off signals for sampling is to use a directional coupler.
Their PCB implimentation of a directional coupler is tried and true. They look like 10DB couplers. IF I had to put a number on it.
Good job on the teardown.
One of your very best RF teardowns yet...


 :-+ :-+ :-+
 
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Offline Someone

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #12 on: June 22, 2016, 11:38:11 pm »
Daylight = 500THz

Terahertz
 

Offline AF6LJ

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #13 on: June 23, 2016, 12:21:55 am »
Sue AF6LJ
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Offline NANDBlog

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #14 on: June 23, 2016, 03:29:52 pm »
I really liked the added effort for this RF equipment. It was too often: "Look RF voodoo and strange looking antennas!". OK, not really, but almost. This was very good.
 

Offline bitseeker

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #15 on: June 23, 2016, 07:00:39 pm »
Best teardown, Dave. The extra time investment clearly shows and the level of detail is appreciated. :-+
I TEA.
 

Online richnormand

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #16 on: June 23, 2016, 07:15:32 pm »
Really appreciated this tear-down and analysis with the diagrams and the board walkthrough of the various stages.
Cheers and thanks Dave. :-+

PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?

REPAIR, RENEW, REUSE, RECYCLE, REBUILD, REDUCE, REPURPOSE, RESTORE....
 

Online tautech

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #17 on: June 23, 2016, 08:17:10 pm »
Really appreciated this tear-down and analysis with the diagrams and the board walkthrough of the various stages.
Cheers and thanks Dave. :-+

PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?
Dave has a reputation for teardowns so any manufacturer shouldn't be at all surprised that he did.

Don't want a teardown and exposure of your design to the world ..... then don't send it to Dave, simple.
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Offline nctnico

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #18 on: June 23, 2016, 09:39:32 pm »
From what I have seen from the teardown there is nothing Siglent should be ashamed off. However the hardware engineers at Siglent should go after their co-workers in the software department with pitch forks more often to make them do a good job as well  >:D
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Online richnormand

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #19 on: June 24, 2016, 12:10:13 am »
From what I have seen from the teardown there is nothing Siglent should be ashamed off.

Fully agree. At this price point this is excellent work.
REPAIR, RENEW, REUSE, RECYCLE, REBUILD, REDUCE, REPURPOSE, RESTORE....
 

Offline EEVblog

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #20 on: June 24, 2016, 12:28:40 am »
PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?

I just got an email from Siglent, they loved the teardown.
 

Offline bitseeker

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #21 on: June 24, 2016, 12:30:52 am »
That excellent, Dave. Now, how can we use that knowledge to work for us?
I TEA.
 

Offline AF6LJ

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #22 on: June 24, 2016, 12:36:56 am »
PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?

I just got an email from Siglent, they loved the teardown.
Good Deal  :-+ :-+
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Online coppice

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #23 on: June 24, 2016, 02:37:27 am »
PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?

I just got an email from Siglent, they loved the teardown.
They might have liked it less if you'd done a parallel teardown of the 3.2GHz model, and found the hardware was identical. :)
 

Online tautech

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Re: EEVblog #892 - Siglent SSA3021X Spectrum Analyser Teardown
« Reply #24 on: June 24, 2016, 03:25:23 am »
PS: considering the comments on the last video comparing the two SP and the fact you did not have it for long I wonder what are the reactions from Siglent on the level of design detail given as well as just opening it?

I just got an email from Siglent, they loved the teardown.
They might have liked it less if you'd done a parallel teardown of the 3.2GHz model, and found the hardware was identical. :)
:-//
We already know it is.
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