Multi-Level Fan-Out Interconnects for IC Package Signal Integrity

The patent transitions from planar interconnect layouts to three-dimensional stacked architectures with multiple interconnect layers at different vertical levels. This dimensional change allows signal paths to be routed through vertical vias and horizontal traces across multiple layers, reducing inductance loops by confining current paths to shorter, more direct routes while maintaining complex device functionality.

The interconnect structure is segmented into multiple functional layers including first and second interconnect layers with distinct signal routing functions. This segmentation allows independent optimization of each layer for specific signal types or impedance requirements, reducing signal interference and improving overall signal integrity while enabling complex device packaging.

The patent employs vertical vias to create three-dimensional signal paths that descend from upper interconnect layers to lower layers, significantly shortening the horizontal distance signals must travel. This vertical routing dimension reduces inductive looping by eliminating the need for long horizontal return paths, thereby reducing signal losses while maintaining comprehensive device connectivity.

The patent merges signal and power interconnect functions into an integrated multi-layer architecture where signal traces, power traces, and ground references are combined in a coordinated fashion across multiple layers. This merging allows for optimized current loops with minimal area, reducing inductance and signal losses while maintaining full device connectivity.