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| Oscilloscope ASIC Kickstarter instead of Open scope. |
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| Mechatrommer:
--- Quote from: David Hess on January 14, 2020, 06:04:32 am ---The low impedance part of the signal path is much easier than the high impedance part because the later requires a good substrate which does not suffer from excessive hook. This is why you find high quality oscilloscopes with plastic substrates for the high impedance attenuators and modern DSOs and high voltage differential probes with bad transient response after a couple years because the FR4 substrate they used absorbed water. --- End quote --- lecroy 50 ohm scope has add-on adapter called AP-1M, to provide high impedance measurement, you can search eevblog i posted the internal of it, but only to few hundreds MHz BW. for GHz BW high impedance? :scared: i never seen one and not have a plan to even think about it. otherwise, i will have a very serious time (and probably financial) damage into it. but i think whats the point of trying hard to design HBW HiZ circuit when we can have or design active probe or such an AP-1M adapter in the next project phase? the AP-1M doesnt have special ASIC nor fancy ICs, only BJT/FET discreetes, but LeCroy charge them like K$, its like nuts when thinking about it. but when think further, they probably need to gather $ from surrounding ecosystem that they have introduced, to cope with ASIC damaged they experienced on the DSO side. this is i guess how they keep going.. |
| TheUnnamedNewbie:
--- Quote from: unitedatoms on January 11, 2020, 07:58:43 am ---Well. In my world, there is no NEW semiconductor development happening in anywhere except USA or perhaps South Korea. Nothing. May be all those silicon developers in Europe are attending their jobs, work, come back home. And no effect is felt anywhere. The progress of things in 21st century is pathetic. The guys in Europe are faking each to other, because they have learned how to fake the things recently. In USA the fakery was popular and was quickly unlearned long before. --- End quote --- Yes, it is not like imec, arguable the most high-ranking and advanced semiconductor research center in the world, is not european. Or, when you look at research output, that some of the most skilled analog/RF semiconductor research groups are in europe (don't know bout digital - not my field). Or that the 256 GS/s ADC that is the hart of that 110 GHz scope is in part developed in Europe. Or, ever heard of these rohde&Schwarz guys? I can go on... But I feel like there will be little point to go on here, since you made up your mind already |
| nctnico:
--- Quote from: OwO on January 14, 2020, 03:16:24 am --- --- Quote from: nctnico on January 13, 2020, 05:38:45 pm ---True. Part costs are completely irrelevant at this point as the engineering effort in the software dwarfs any effort needed for the hardware. A project starting with looking for the cheapest parts never ends well (or never ends at all). --- End quote --- I don't know why you keep saying parts cost aren't important, but in projects like these with one of the most cost sensitive market you can imagine (hobbyists), parts costs literally make or break a product. Look at an example, the NanoVNA. Basic math shows it's worth spending ONE ENGINEER YEAR to save $1 USD of BOM cost, with payback being just over one year. Yes, every dollar you save on the BOM pays for one full time engineer who can then bring far more value to the product. --- End quote --- It really doesn't matter at this stage. First get software going and then look at which platforms it can actually run on. There has to be some traction from companies to contribute at some point. Starting oscilloscope development at the hardware end is absolutely the wrong way to take such a project on. Been there, done that. |
| iMo:
--- Quote ---It really doesn't matter at this stage. First get software going and then look at which platforms it can actually run on. --- End quote --- Hmm, I doubt so. Nobody will start to mess with fw/sw development unless he/she/it sees the hw first. Unless you are getting $$ for such an effort you will not do.. The community willing to develop open fw/sw usually have to see tangible "something" they are attracted to, what they can buy cheap, and what is readily available such there will be a critical mass of people around it soon. An recent example: user atadarov and his effort with the cheapo stm32 scope.. |
| ogden:
--- Quote from: imo on January 14, 2020, 09:28:52 am ---The community willing to develop open fw/sw usually have to see tangible "something" they are attracted to --- End quote --- This is typical chicken & egg paradox of hardware+software development. I doubt community will be attracted to bare PCB. Someone have to design & code "version zero" software for community to take over. |
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