3D IC Vertical Interconnect Layout for Lower TSV IR Drop
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Solution Overview
Problem
Current 3D stacked integrated circuits face challenges in optimizing the layout and density of through-silicon vias (TSVs) across different die layers to efficiently transmit power and data signals while minimizing IR drop, which affects the performance and area usage of the integrated circuits.
Innovation Solution
The solution involves arranging TSVs in a grid layout on each die layer with varying densities and pitches based on the power requirements of the devices on each layer, allowing for optimized area usage and signal routing, and using an electronic design application (EDA) to determine the best layout for each die layer to ensure efficient signal transmission and reduced IR drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TSV density is increased to reduce IR drop, then power delivery performance is improved, but fabrication complexity and cost increase
Solution Approach 1:
The patent applies different TSV densities to different regions of the die based on local power requirements. High-power regions receive higher TSV density while low-power regions use lower density, optimizing power delivery without uniformly increasing fabrication complexity across the entire die.
Solution Approach 2:
The patent varies TSV pitch and density parameters across different die layers and regions. By changing these geometric parameters adaptively rather than using fixed values, the design achieves better power delivery performance without proportionally increasing fabrication complexity.
2Area of stationary object
If TSV pitch is reduced to improve signal routing, then area usage is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the die into multiple regions with different TSV pitch values. Rather than using a single uniform pitch across the entire die, different segments have optimized pitch values that balance area efficiency with manufacturable precision requirements.
Solution Approach 2:
Different regions of the die are assigned different TSV pitch values based on local routing needs. This allows tight pitch in areas requiring dense routing while maintaining larger pitch in areas where manufacturing precision is more challenging, optimizing both area usage and manufacturability.
3Power
If varying TSV density across die layers is implemented, then power requirements are optimized, but layout complexity increases
Solution Approach 1:
The patent implements dynamic TSV density variation across different die layers, adapting the TSV layout to match the specific power requirements of each layer. This dynamic approach optimizes power delivery for heterogeneous multi-die stacks while using systematic methods to manage layout complexity.
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).