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Actually the recommendation for BGAs is not to decouple on each power pin but to decouple the planes instead. Connect each power pin to the relevant power plane with their own via, and connect each decoupling capacitor to the relevant plane with its own via (or, if you have the space, with multiple vias for each capacitor). This is the best way to reduce the series inductance between the BGA and the decoupling capacitors.
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Do You suggest a dedicated whole power planes for each voltage or a single power plane consisting of several islands for each voltage?
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