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Show us your square wave

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BillyO:
Lowest cost candidate: Home made fast risetime oscillator

Cost: Less than $10
Risetime: 1.36nS  (actually more like 1nS taking into account the risetime of the scope)

Shown on a 600MHz scope (to show all the ringing).  It looks really nice on a 200MHz or 100MHz scope!



David Hess:

--- Quote from: BillyO on June 08, 2024, 06:10:25 pm ---Shown on a 600MHz scope (to show all the ringing).  It looks really nice on a 200MHz or 100MHz scope!
--- End quote ---

You should reconsider your oscilloscope choice if you want to see the ringing.  That is not ringing unless ringing can happen *before* the edge.

I can explain it, but I would like to see what others think is going on.

BillyO:
Well, it is "ringing" before the edge because of the propagation skew between the different inverters?


Edit:
But, wait, you don't think it's because of that, do you?  That's good because like others that have suggested that, you'd be wrong.

No, you think it's being caused by the scope.  Aliasing because, in your opinion, it's a "shitty Chinese scope", right?  Well, if that's what you think then you are still wrong.

If that's not what you think, then I'd love to hear what you think it is.

MarkL:
I think there might be a small amount of actual ringing after the edge because the ringing before and after the edge is not perfectly symmetric wrt to the edge, but most of it looks like Gibbs artifacts to me.

  https://www.signalintegrityjournal.com/articles/2175-how-to-avoid-gibbs-ringing-artifacts-in-measurements

BillyO:

--- Quote from: MarkL on June 09, 2024, 12:51:43 am ---I think there might be a small amount of actual ringing after the edge because the ringing before and after the edge is not perfectly symmetric wrt to the edge, but most of it looks like Gibbs artifacts to me.

  https://www.signalintegrityjournal.com/articles/2175-how-to-avoid-gibbs-ringing-artifacts-in-measurements

--- End quote ---

Good guess, but not in this case.  With Gibbs artifacts, the effect get's worse with faster rise times.  This screen shot is the same scope with the same Bodnar pulser as was used in that article.


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