3 ms·
I like this article a lot, but it doesn't hammer home the fullest, easiest statement of this kind of lazy-best-effort decoupling: pick the smallest package you
by exmadscientist 2y ago
I like this article a lot, but it doesn't hammer home the fullest, easiest statement of this kind of lazy-best-effort decoupling: pick the smallest package you are willing to deal with, then buy the biggest value of capacitor you are willing to pay for in that package. Loop area really does rule all, and if you don't know that, you're going to have a hard time of it.
The article also doesn't do a particularly good job of making the argument against relying on the "notch" (seen here at 25–40MHz), which is that the notch moves. It moves around with just about any change in... anything... so you can either pay the heavy price to genuinely control it (it can be actually worthwhile to drop a notch on things in certain analog applications; think knocking out a DAC clock frequency in a reconstruction filter) or you can ignore that the notch exists. Usually that's the easier option!