Die-to-wafer (DtW) stacking offers a yield advantage over wafer-to-wafer (WtW) and system-on-a-chip (SoC) if testing can identify good die and reduce stacking of good and bad die pairs. In this study, an SoC is broken into two equal areas to form a 3D system, and best case yields of DtW and WtW is compared. Testing need not be perfect to realize significant yield advantage with DtW.
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Smith et al. (2007) studied this question.
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