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A three-dimensional integrated circuit (3D IC) is a MOS (metal-oxide semiconductor) integrated circuit (IC) manufactured by stacking as many as 16 or more ICs and interconnecting them vertically using, for instance, through-silicon vias (TSVs) or Cu-Cu (copper-copper) connections, so that they behave as a single device to achieve performance improvements at reduced power and with a smaller footprint than conventional

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