<p>so remember when I was joking about replacing FR-4 prepreg with a layer of barium titanate ceramic so you could have your entire power and ground layers act like a big distributed capacitor?</p><p>yeah turns out 3M had the same idea. they ground up a bunch of barium titanate, mixed it into their epoxy, and used it to make a line of fiberglass dielectrics for high embedded capacitance within PCBs. it achieves 14nF/in² and they sell it under the name "C-Ply".</p><p><a href="https://www.ipc.org/system/files/technical_resource/E10%26S22_02.pdf" target="_blank" rel="nofollow noopener noreferrer" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">ipc.org/system/files/technical</span><span class="invisible">_resource/E10%26S22_02.pdf</span></a></p><p><a href="https://chaos.social/tags/electronics" class="mention hashtag" rel="tag">#<span>electronics</span></a></p>
