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   Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Wednesday, 27-Mar-2024 03:36:15 JST Andrew Zonenberg

   And rework complete, let's see how it turned out...

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     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Wednesday, 27-Mar-2024 03:36:14 JST Andrew Zonenberg

     in reply to

     Whoops. I bodged the wrong vias.

     That's going from 3V0_N to ground not 3V3 to ground.

     That explains why the input ripple wasn't impacted much. Let's see if I can squeeze another cap right next to it...

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     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Wednesday, 27-Mar-2024 03:36:14 JST Andrew Zonenberg

     in reply to

     And after the second cap the 3V3 spikes are massively reduced and the output ripple is down to 286 mV p-p.

     I think that's it for tonight as it's getting late. Tomorrow I'll see about adding some back side caps and see if I can cut these spikes down even further.

     Clearly on the right track, though.

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     Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Wednesday, 27-Mar-2024 03:36:15 JST Andrew Zonenberg

     in reply to

     I'm gonna say *that* did something.

     602 -> 380 mV p-p ripple reduction from that one cap.

     I can't easily fit much more on the top so let's see what happens if I add an 0402 on the bottom straddling the same vias. Hopefully the extra ESL won't matter TOO much.