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Timeline for Why AC coupling on main VDD line?

Current License: CC BY-SA 3.0

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Aug 1, 2017 at 20:17 comment added user140123 So even though there's tons of decoupling caps on that rail to block ac, the addition of coupled caps to allow ac to go to ground is still needed as extra protection? I thought maybe it had to do with display information since it says referenced to ground using MIPI?
Aug 1, 2017 at 20:08 history answered Marcus Müller CC BY-SA 3.0