3D Microelectronic Die Assembly for Interconnect and Thermal Limits

The patent transitions from planar (2D) die arrangement to three-dimensional (3D) stacked configuration, stacking dies vertically to achieve higher integration density without increasing package footprint. This dimensional change enables compact packaging while maintaining manufacturing feasibility through established bonding processes.

The patent implements nested interconnection structures where multiple interconnect layers are stacked vertically, with each layer containing conductive pathways that route signals between dies. The interconnect structure is nested within the package, with redistribution layers and through-silicon vias creating a compact hierarchical interconnection system.

The patent introduces an intermediary substrate or interposer that serves as a thermal management interface between the stacked dies and the external environment. This intermediary structure provides thermal pathways and can incorporate heat spreaders or thermal vias to improve heat dissipation while maintaining electrical interconnections.

The package substrate serves multiple functions simultaneously: it provides mechanical support for the stacked dies, establishes electrical interconnections through redistribution layers, and facilitates thermal management through integrated heat spreading pathways. This multi-functionality reduces the need for separate thermal management components.

The patent resolves interconnect congestion by transitioning from planar routing to three-dimensional interconnection. Multiple interconnect layers are stacked vertically, allowing signals to route in the vertical dimension rather than competing for horizontal routing space. This enables higher signal density without increasing lateral interconnect width or complexity.

The patent segments the interconnection system into multiple discrete layers, with each layer handling specific signal routes. Through-silicon vias and redistribution layers create segmented pathways that distribute interconnect traffic across multiple levels, reducing congestion at any single interface and enabling modular manufacturing approaches.

The patent achieves higher power efficiency by stacking dies vertically, which dramatically reduces the length of interconnect pathways compared to lateral arrangements. Shorter interconnects reduce resistive losses and capacitive loading, enabling lower power consumption for the same data throughput while maintaining cost-effective manufacturing through standard bonding processes.

The patent performs preliminary integration by stacking and bonding dies before final package assembly, creating pre-integrated interconnect structures. This preliminary action establishes optimized signal pathways early in the manufacturing process, enabling subsequent steps to focus on packaging rather than complex interconnect routing, thereby reducing overall system power consumption.

The patent increases bandwidth by utilizing the vertical dimension for multiple parallel interconnect layers. Each layer can carry independent signal traffic, effectively multiplying the data throughput capacity. This three-dimensional interconnection enables high-bandwidth applications while maintaining cost-effective manufacturing through established die-stacking processes.

The patent implements nested interconnection structures where multiple interconnect layers are contained within the vertical stack, with each layer providing additional bandwidth capacity. This nested arrangement allows signals to be routed through different layers, creating parallel data pathways that increase overall bandwidth while maintaining a compact package footprint.