Electromigration Compensation via Tapered Lead Geometry
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Solution Overview
Problem
The increasing demand for efficient and robust integrated circuits due to reduced wire sizes and increased interconnections leads to unmet needs in addressing interconnect failures caused by electromigration, which results in lead resistance and circuit shorting.
Innovation Solution
The electromigration compensation system (EMCS) assesses susceptibility to electromigration failure by using a via-node-based algorithm that calculates current divergence and recommends compensatory actions such as designing leads with interwoven horizontally-tapered ends and adjusting lead widths to reduce electromigration divergence, implemented within a design system that includes a CPU and memory for assessing and mitigating electromigration risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wire sizes are reduced to increase interconnection density, then productivity and capacity are improved, but reliability deteriorates due to increased susceptibility to electromigration failures
Solution Approach 1:
The patent applies local quality by making leads with interwoven horizontally-tapered ends, where the lead width varies along its length. Specifically, the lead width transitions from a first width to a second width in a tapered manner, creating non-uniform local properties that compensate for electromigration effects in specific high-stress regions while maintaining overall interconnection density
Solution Approach 2:
The patent changes the geometric parameters of the leads by implementing horizontal tapering, where the lead width parameter varies continuously along the lead length. This parameter change creates regions of different current density distribution, effectively compensating for electromigration-induced material transport without requiring larger overall wire sizes
2Productivity
If the number of interconnections is increased, then capacity and efficiency are improved, but reliability deteriorates due to higher risk of electromigration-induced shorting
Solution Approach 1:
The interwoven horizontally-tapered lead structure creates local variations in current density distribution through its non-uniform width profile. This local quality modification reduces peak current densities at critical interfaces, thereby preventing electromigration-induced void formation and shorting in high-density interconnection regions
Solution Approach 2:
The compensatory lead design with predetermined horizontal tapering is implemented during the design phase to preemptively counteract electromigration effects. The geometric compensation is built into the lead structure before operation, preventing electromigration failures rather than addressing them after they occur
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The EMCS significantly increases the robustness of integrated circuits by reducing electromigration-induced failures, enhancing lead lifetime by up to ten times compared to existing technologies, and effectively handles complex lead configurations.
Implementation Method 1
The electromigration compensation system (EMCS) assesses susceptibility to electromigration failure by using a via-node-based algorithm that calculates current divergence
Data Source
AI summary
An integrated circuit is described. The integrated circuit, comprising: a central processor; a memory; and an electromigration compensation system associated with a plurality of leads within the integrated circuit, wherein the electromigration compensation system causes the plurality of leads to have interlocking, horizontally tapered ends that substantially reduces electromigration divergence and consequently lead resistance and circuit shorting.