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power decoupling myths

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electrolust:
https://www.signalintegrityjournal.com/articles/1589-the-myth-of-three-capacitor-values (2020)
https://ewh.ieee.org/r3/enc/emcs/archive/2012-10-10b_DecouplingMyths.pdf (2012)

Bud:

--- Quote ---The best approach is to always do your own analysis
--- End quote ---
The best approach is to hook up a spectrum analyzer to the first revision board and adjust the capacitors values for best noise supression within the range of frequencies of interest. Any other aporoach you will be shooting in the dark.

Tomorokoshi:
That is similar to the Hoffman Effect!

https://conradhoffman.com/hoffman_effect.htm

David Hess:
I would be more impressed if some empirical designs which failed that analysis were included, with an analysis of why they failed.

I had nearly perfect application to make a test case for three different values versus three of the same value.  Initially 12 surface mount capacitors of the same large value were placed in parallel *in a radially symmetrical transmission line structure*, and it completely failed up to 1.2 GHz.  Replacing the capacitors with a set using three decades of values worked from 50 MHz to 1.2 GHz.

The only reason I even initially tried the 12 larger value capacitors was because in theory, as given in the examples above, it should have worked, but I was skeptical enough to have also ordered additional capacitors to make a decade set which ended up saving me considerable time.

CatalinaWOW:
I object to this use of of the word, myths, which is found widely in Facebook clickbait.

The articles are completely correct, new packaging techniques have changed the rules for design, but the old rules were not anti-factual.  Just limited applicability.

It is like calling turn of the twentieth century engineering handbooks myths because they have tables of strength of various wood species that cannot be duplicated today.  The tables were correct for the old growth wood being used almost totally at the time.  They don't apply to wood grown in rapid growth tree farms which constitute much of the wood on the market today.

Engineers in all fields have to understand what they are doing.  If they don't they are really technicians.  Or amateurs.

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