TNP #47 - SHF 100CP 20GHz Broadband GaAs FET Amplifier Teardown & Experiments

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  • Опубліковано 8 лис 2024

КОМЕНТАРІ • 75

  • @kevy1yt
    @kevy1yt 8 місяців тому +85

    Yes, would love to know more about the BER.

    • @PixelSchnitzel
      @PixelSchnitzel 8 місяців тому +1

      YES!!!

    • @OutThere458
      @OutThere458 8 місяців тому +2

      Yes definitely! I didn't know that BER analysis could be a dedicated instrument.

    • @fredflickinger643
      @fredflickinger643 8 місяців тому +1

      Looking forward to it!

    • @steve_case
      @steve_case 8 місяців тому

      Yes, and BER with optics.

  • @OneBiOzZ
    @OneBiOzZ 8 місяців тому +11

    we have procedures to test all equipment before declaring a device or product defective as previously someone tossed thousands of dollars in devices due to a faulty bench power supply used to test them and i heard a similar story from a friend where thousands of dollars were tossed due to a faulty SMA cable
    Always test your test equipment

  • @YSPACElabs
    @YSPACElabs 8 місяців тому +15

    Ah yes, just an RF amplifier in a dumpster. TELL ME WHERE ARE THESE MAGIC DUMPSTERS!!!?

    • @garci66
      @garci66 8 місяців тому +2

      Nokia / bell labs most probably. I've done my fair share of touring old / empty buildings of the company and ran into a cubicle with maybe 10.HP vintage spectrum analyzers. Not yet in the dumpster... But given they were sitting next do discarded drywall... Not far off.

  • @solosailorsv8065
    @solosailorsv8065 8 місяців тому +2

    Old School SMT components, hand soldered under a microscope. WOW
    Without two more stages for input and output matching, I am Impressed !

  • @MrMersh-ts7jl
    @MrMersh-ts7jl 8 місяців тому +11

    Your content so entertaining that although this is miles above my head I watch with so much enthusiasm. You're enthusiasm is very infectious. Thank you

  • @bluesteelbass
    @bluesteelbass 8 місяців тому +3

    Interesting the circuit board trace design from then to now for GHz and beyond Low Noise Amplifiers. Very, very good to see the small variations in solder amounts will not detrimentally affect things to ~20GHz for DIY projects.
    😛Keep me in mind if you ever find the dish and feed that accompanied that LNA find!

  • @regweldrotmg
    @regweldrotmg 8 місяців тому +2

    I love how they used the through hole components like a bridge to hop the DC over the RF signal line

  • @wolpumba4099
    @wolpumba4099 8 місяців тому +9

    I'm interested to learn more about bit-error rate.

  • @rolfdieterklein
    @rolfdieterklein 8 місяців тому +2

    yes please showing more on BER would be great. -- excellent video of this nice device.

  • @donepearce
    @donepearce 8 місяців тому +33

    Where do you find your dumpsters?

    • @loberd09
      @loberd09 8 місяців тому +6

      If im not mistaken around bell labs

    • @glasslinger
      @glasslinger 8 місяців тому +2

      I hear this dumpster stuff and wonder if someone "threw it away" so they could get it past security to reclaim it later!

    • @liam3284
      @liam3284 8 місяців тому

      Maybe get around export controls?

  • @bansci
    @bansci 8 місяців тому +4

    Really nice to see the hand construction of the bias circuitry. Would have thought placing that large inductor over the output trace would have given some issues... I know it's perpendicular, but the coils aren't!

    • @glasslinger
      @glasslinger 8 місяців тому +1

      Maybe the cause of some of the ripples in the trace.

  • @chrisdickens4862
    @chrisdickens4862 8 місяців тому

    The multistage inductor concept is interesting. Thanks for the great video!

    • @liam3284
      @liam3284 8 місяців тому

      I found this idea works for switching power supplies as well. Filter out the energy in the switching transient for improved efficiency, better EMC.

  • @lucvanhove9639
    @lucvanhove9639 8 місяців тому

    This must work with specific selected components, normaly we adjust by cutting a part of the trace or add a silver band arround the transistors. Adjust the coupling with small ceramic blocks for optimal results of power vs reflection and oscillation.

  • @neekonsaadat2532
    @neekonsaadat2532 5 місяців тому +1

    Fantastic video

  • @vincei4252
    @vincei4252 8 місяців тому +15

    The only dumpsters I have near my house have all the waste from an IGA supermarket. 😭😭😭not about to go diving in that 😂

    • @tomteiter7192
      @tomteiter7192 8 місяців тому +8

      Yeah, I wonder where all these glorious dumpsters are. Here in germany all has to go "the right, triple signed, and pencil pusher defined way" and you even can't take something from the community eWaste disposal sites. DAS IST VERBOTEN! A few weeks ago there was a Commodore VC-20 I wasn't allowed to take home. I tried to explain, but the low wage drones only knew DAS IST VERBOTEN!
      It's a damn shame...

    • @amogusenjoyer
      @amogusenjoyer 8 місяців тому

      ​@@tomteiter7192he works at bell labs, probably related :)

    • @andreagiudici926
      @andreagiudici926 8 місяців тому +1

      😢

  • @macgillie4560
    @macgillie4560 8 місяців тому +2

    Please, would love a video on BER. Maybe enhance it with packet loss in Ethernet networks? I.e. RFC2544 testing.

  • @martinsiebert1368
    @martinsiebert1368 8 місяців тому

    I am analyzing the distributed amplifier in my current restoration project of an Tektronix Oscilloscope 545A. I learn much of this. With smaller geometric size of semiconductors and physics of this, we gain GHz-Amplifiers! I see integration of distributed amplifiers on semiconductors with antenna arrays on chip, connecting things on home cinema together in households. Now my question for you: I cannot compete with the necessary measurement equipment for this. Would you show poor mans solutions in GHz-range in measurements requirements for your patrons?

  • @vincei4252
    @vincei4252 8 місяців тому +4

    LMAO at the Ripley joke. Was that orange pooch under her arm ?

  • @Darkknight512
    @Darkknight512 8 місяців тому

    If you do a video on BERT, can you do a combination video, looking at a backplane or cable performance with a BERT instrument but then also the same measurement using an FPGAs internal BERT like Xilinx's IBERT? Would be nice to see the differences.

  • @mohamedlanjri
    @mohamedlanjri 26 днів тому

    Most likely is due to glass crazing/etching. Overtime the tungsten will evaporate and deposit on the glass making the insulation more conductive and prone to shorts.

  • @aishwaryagunaputi009
    @aishwaryagunaputi009 8 місяців тому +2

    Would love a video tutorial on BERT!!

  • @JohnDoe-es5xh
    @JohnDoe-es5xh 8 місяців тому +3

    Maybe this amp has problems with the long term temperatur stability and was thrown away caused by that? It's not unusual as I experienced turing my working life.

    • @jimomertz
      @jimomertz 8 місяців тому

      That’s what I was thinking. Maybe after a couple of hours of use, it gets hot and dies.

    • @Thesignalpath
      @Thesignalpath  8 місяців тому +2

      I did run it for hours, and it continued to work. But it is possible that it could fail with time.

  • @xDevscom_EE
    @xDevscom_EE 8 місяців тому +1

    What are the square crossed patches on the dielectric substrate and lines near the input and output transmission line traces? Capacitive fine-tuning?

  • @sparticl3
    @sparticl3 8 місяців тому

    Would love to know which dumpsters you are haunting to find some of this gear lol. The ones around my area are not nearly as fruitful!

  • @jorikvarta81
    @jorikvarta81 8 місяців тому +3

    Ripley 🤗

  • @TheBackyardChemist
    @TheBackyardChemist 8 місяців тому +3

    All GaAs, no brakes

  • @GoldRimmer
    @GoldRimmer 8 місяців тому +3

    I always get anxiety when you wave metal scribers near displays and miniature components.

    • @Thesignalpath
      @Thesignalpath  8 місяців тому +5

      The tool is further from the display or components than it seems from the video. :)

  • @jozefnovak7750
    @jozefnovak7750 8 місяців тому

    Super!

  • @jamwaffles
    @jamwaffles 8 місяців тому +1

    Please do a video on BERTs!

  • @wolpumba4099
    @wolpumba4099 8 місяців тому +2

    could you x-ray the amplifiers? or is it impossible to get the board out?

  • @MrJef06
    @MrJef06 8 місяців тому

    When you're an RF engineer you don't say "connect backwards" you say "reverse bias" 😂

  • @_wave64_
    @_wave64_ 8 місяців тому +2

    Where is that dumpster??

  • @brothertheo2677
    @brothertheo2677 8 місяців тому +2

    It looks like you never test the amp down to 100 khz. Perhaps the failure is there. Or did I miss something?

    • @hinz1
      @hinz1 8 місяців тому

      It's AC coupled, so it never goes down to DC. Also, hardly anyone who uses these amps, cares for below 100MHz performance on these things, when looking at GHz signals ;-)

    • @LightningHelix101
      @LightningHelix101 8 місяців тому +1

      @@hinz1it was a good thought though. Maybe this is needed for some system that has low and high frequency performance which is why it would be specked down to such a large BW.

    • @liam3284
      @liam3284 8 місяців тому

      Maybe someone was using it for HF?

  • @Kevin_geekgineering
    @Kevin_geekgineering 8 місяців тому

    where exactly is your dumpster?

  • @ostrov11
    @ostrov11 8 місяців тому

    спасибо хорошая работа

  • @carlos_dox
    @carlos_dox 8 місяців тому

    BERT tutorial please 😀

  • @erisugiatmoko8692
    @erisugiatmoko8692 8 місяців тому

    Pardon, what's this function?

  • @chrismumford9206
    @chrismumford9206 8 місяців тому

    can you take an x-ray?

  • @lorinczhuff2022
    @lorinczhuff2022 8 місяців тому

    I don't know how to say this any other way. Can I have the amplifier?

  • @zyeborm
    @zyeborm 8 місяців тому

    Does Bert have a friend called Ernie? 😂

  • @Richardincancale
    @Richardincancale 8 місяців тому +1

    4:10 😂😂😂

  • @hinz1
    @hinz1 8 місяців тому +1

    No DC block and no attenuation on input?
    Next, OMG, broken dumpster amplifier blew my $50k VNA ;-))

  • @davidgustafik7968
    @davidgustafik7968 8 місяців тому

    You should sell tickets to your dumpster.

  • @YDKMPablo
    @YDKMPablo 8 місяців тому +1

    Let's open it and see if something is roasted.
    Nay... Let's diagnose the failure with $500 k worth in toys to open it anyway... 😀

  • @deanagoes2791
    @deanagoes2791 8 місяців тому

    Saya bahkan tidak tahu kenapa saya menonton ini 🤦

  • @zahirkhan778
    @zahirkhan778 8 місяців тому

    I think you need to slow the speech to 0.9x you speak too fast for a newbie like me to keep up.

  • @IGBeTix-Electronique
    @IGBeTix-Electronique 8 місяців тому

    Hi, interesting but the flow of speaking is to much high for foreign people....

    • @Richardincancale
      @Richardincancale 8 місяців тому +2

      Did you know the UA-cam application allows you to slow down replay to a half or even a quarter speed? It works well

    • @IGBeTix-Electronique
      @IGBeTix-Electronique 8 місяців тому

      @@Richardincancale ok thanks

    • @timeltdme4355
      @timeltdme4355 8 місяців тому

      personally i hate slow speakers and fast forward or even skip most of the content, but not here

  • @PlasmaHH
    @PlasmaHH 8 місяців тому

    wtf kind of dumpster you have?

  • @wolpumba4099
    @wolpumba4099 8 місяців тому +3

    Here's an "Explain Like I'm Five" version of the abstract, focusing on
    the most interesting parts:
    *What's this video about?*
    This video is about a cool machine found in the trash! It's called an
    amplifier, which makes tiny signals bigger. Think of it like a
    megaphone for electricity!
    *What's so special about it?*
    This amplifier works with really, really fast signals, which is tricky
    to do. It was labeled as broken, but it actually works perfectly!
    *What did they do?*
    They tested the amplifier to make sure it was working and then they
    opened it up to see how it's made. It has these special parts inside
    called "fets" and lots of twisty wires to make the signals go super
    fast.
    *Why couldn't they break it?*
    They wanted to break open the special parts to really see how they
    work. But, since the amplifier works, they didn't want to ruin it!
    *Abstract*
    This video explores the internal workings of a dumpster-salvaged 20
    GHz amplifier labeled as broken. Surprisingly, the amplifier was found
    to be functional, delivering 20 dB of gain as specified. Its broadband
    design incorporates gallium arsenide FET devices for high
    performance. The examination reveals a multi-stage construction with
    careful bias networks and thermal management. While the desire to
    analyze the die inside was unfulfilled due to the unit's
    functionality, the video provides insights into the construction
    principles of high-frequency amplifiers.
    disclaimer: i used whisper and gemini. this method can't recognize all words and can't distinguish multiple speakers

    • @wolpumba4099
      @wolpumba4099 8 місяців тому

      @@alifesh gemini tends refer to "the authors" if you give it a text like this transcript and ask for the eli5 abstract. i didn't think it worthwhile to fiddle with the prompt to fix this.

    • @DmitryAvsioukov
      @DmitryAvsioukov 8 місяців тому

      ​@@alifeshnowadays "they" is a common way to refer to a single person while not specifying gender, i.e. not saying "he" nor "she", but "they"