3D IC Vertical Interconnect Layout for Lower IR Drop
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Solution Overview
Problem
Existing 3D integrated circuits face challenges in efficiently connecting multiple die layers with uniform density and layout of vertical interconnect structures, leading to inefficiencies in power signal transmission and increased IR drop.
Innovation Solution
The implementation of vertically stacked die layers with varying layouts and densities of vertical interconnect structures (VISs) tailored to the specific power requirements of each layer, using through-silicon vias (TSVs) to optimize area usage and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform density and layout of vertical interconnect structures are used across all die layers, then manufacturing simplicity is maintained, but power signal transmission efficiency deteriorates and IR drop increases
Solution Approach 1:
The patent implements varying densities of vertical interconnect structures (VISs) in different die layers, with higher density in power-hungry layers and lower density in less demanding layers. This local optimization approach allows each layer to have the appropriate VIS density for its specific power requirements, improving overall power signal transmission efficiency while avoiding the uniform density constraint that causes high IR drop.
2Reliability
If varying layouts and densities of VISs are implemented to optimize power requirements, then power signal transmission efficiency improves, but device complexity increases
Solution Approach 1:
The patent divides the 3D IC into multiple die layers, each with independently optimized VIS layouts and densities based on their specific power requirements. This segmentation allows complex optimization to be applied locally to each layer rather than requiring a single complex solution for the entire structure, making the overall implementation more manageable.
3Reliability
If higher density of VISs is used in power-hungry die layers, then IR drop is reduced, but area usage increases
Solution Approach 1:
The patent applies higher VIS density only in specific die layers that have high power requirements, while using lower density in layers with moderate or low power needs. This localized approach ensures that area is consumed only where necessary for power delivery, optimizing the trade-off between IR drop reduction and area usage rather than uniformly increasing density across all layers.
Data Source
AI summary
A 3D IC structure includes multiple die layers, such as a top die layer and a bottom die layer. The top die layer and/or the bottom die layer each includes devices such as computing units, Analog-to-Digital converters, analog circuits, RF circuits, logic circuits, sensors, Input/Output devices, and/or memory devices. The devices on the first and the second die layers are laterally surrounded by, or adjacent, vertical interconnect structures (VIS).