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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Oscilloscope delivers 25 GHz bandwith on 4 channels
Date: Sun, 8 Dec 2024 20:41:51 -0000 (UTC)
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john larkin <JL@gct.com> wrote:
> On Sun, 8 Dec 2024 18:26:07 +0100, Jeroen Belleman
> <jeroen@nospam.please> wrote:
> 
>> On 12/8/24 16:53, john larkin wrote:
>>> On Sun, 8 Dec 2024 12:11:47 +0100, Klaus Vestergaard Kragelund
>>> <klauskvik@hotmail.com> wrote:
>>> 
>>>> On 07-12-2024 07:00, Jan Panteltje wrote:
>>>>> On a sunny day (Fri, 6 Dec 2024 17:59:30 +0100) it happened Lasse Langwadt
>>>>> <llc@fonz.dk> wrote in <vivahi$2etnj$2@dont-email.me>:
>>>>> 
>>>>>> On 12/5/24 11:31, Jan Panteltje wrote:
>>>>>>> Oscilloscope Delivers 25-GHz Bandwidth on Four Channels
>>>>>>> 
>>>>>>> https://www.electronicdesign.com/technologies/test-measurement/oscilloscopes/article/55247306/electronic-design-pico-technology-oscilloscope-delivers-25-ghz-bandwidth-on-four-channels
>>>>>>> Pico Technology expanded its PicoScope 9400 Series with the
>>>>>>> PicoScope 9404A-25, a high-performance oscilloscope with 25 GHz of
>>>>>>> bandwidth on four channels. The company's Sampler-Extended
>>>>>>> Real-Time Oscilloscope (SXRTO) technology integrates real-time
>>>>>>> acquisition with sampling oscilloscope capabilities. Thus, the
>>>>>>> scope can trigger directly on the signal while recording pre-trigger
>>>>>>> data, with the high time and amplitude resolution of a sampling scope.
>>>>>>> 
>>>>>>> https://www.electronicdesign.com/techxchange/article/55238271/advanced-oscilloscope-techniques
>>>>>>> 
>>>>>>> https://www.picotech.com/products/oscilloscope/picoscope-9000-series/picoscope-9400a-series-sampler-extended-real-time-oscilloscope
>>>>>>> 
>>>>>>> Only 25,645 ?
>>>>>>> 
>>>>>>> For the real audiophiles!!
>>>>>>> 
>>>>>> 
>>>>>> https://www.youtube.com/watch?v=DXYje2B04xE
>>>>>> 
>>>>>> 110GHz bandwidth, 256GS/s four channels, only ~$2M
>>>>> 
>>>>> 
>>>>> https://www.keysight.com/us/en/product/UXR1102A/infiniium-uxr-series-oscilloscope-110-ghz-2-channels.html
>>>>> 
>>>>> When I want to see 10 GHz signals I use an old 5 dollar LNB and
>>>>> downconvert to about 1 GHz...
>>>>> that into a 35 dollar RTL_SDR stick.
>>>>> I know it is not the same, but 100 GHz downconvert should not cost hat much more
>>>>> At higher frequencies lasers into non linear crystals as mixer?
>>>>> From the 1.999 M$ left buy a nice house?
>>>>> 
>>>> Very nice idea, but that will work only for sinusoidal signals, right?
>>> 
>>> There were some superhet oscilloscopes that split the input signal
>>> into bands with RF techniques, namely downconverting bands and
>>> digitizing them, then somehow putting that mess back together
>>> mathematically. Of course, one was a LeCroy.
>>> 
>>> Integrated shockline samplers killed that idea.
>>> 
>>> But 100 GHz electrical signals barely exist, so the market is small
>>> for those megabuck scopes.
>>> 
>> 
>> I should be possible to abuse a cheap fast latched comparator as
>> a sampler with ~10GHz bandwidth or so. Something like an ADCMP580.
>> 
>> Jeroen Belleman
> 
> I've done that and have a PCB, TDR actually. It seemed to work but I
> haven't had much time to play with it.
> 
> Does anyone want to take over and see how well it actually works? I
> guess it could become a product.
> 
> https://www.dropbox.com/scl/fi/y88pcdjfd0qovxmpfizwu/Z368.JPG?rlkey=fu4bng7i34yjbol7s1npapp8x&raw=1
> 
> It's one of those tiles.
> 
> 

Simon and I are just finishing up a TDR gizmo for measuring soil moisture
and salinity vs depth for an ag customer.  It’s a 150-ps-class device,
which is much better than good enough for the application, and we’re
getting the first 20 fully-stuffed boards for $23 each from JLCPCB,
including the data converters, MCU, voltage regulators, as well as the TDR
proper. 

It uses a two-diode sampler, which avoids the major pain of sampler design,
the need to match diodes. Of course it has horrible kickout, but that’s
perfectly okay in this situation. 

Fun gizmo. 

Cheers 

Phil Hobbs 



-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics