Merged Pillar Structures for IC Layout Routing Density
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Solution Overview
Problem
The resistance of metal layers in integrated circuits (ICs) affects power delivery efficiency, heat generation, and susceptibility to electromigration, and the routing of these layers impacts the routing of additional electrical connections to functional circuit elements.
Innovation Solution
Merging pairings of short pillar patterns into corresponding medium pillar patterns in the layout diagram of ICs, which increases the vertical-separation distance between them, thereby complying with design rules and allowing for transverse routing while reducing routing resources and improving wiring density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If short pillar patterns are placed close together to increase wiring density, then wiring density improves, but vertical-separation distance becomes insufficient for transverse routing
Solution Approach 1:
The patent merges adjacent short pillar patterns into medium pillar patterns, combining multiple separate structures into unified longer pillars. This merging increases the vertical-separation distance between pillar pairs while maintaining high wiring density in the horizontal plane, resolving the contradiction between compact wiring and sufficient routing clearance.
Solution Approach 2:
The patent transitions from using short pillars arranged in closely-spaced pairs to using medium pillars that extend further in the vertical dimension. By increasing the vertical extent of the pillars, the design achieves sufficient separation distance for transverse routing while maintaining horizontal wiring density through the merged pillar structure.
2Length of moving object
If medium pillar patterns are used instead of short pillar patterns, then vertical-separation distance increases for transverse routing, but routing resources are consumed
Solution Approach 1:
By merging short pillar patterns into medium pillar patterns, the patent reduces the total number of separate pillar structures required. This consolidation achieves the necessary vertical-separation distance while actually reducing routing resource consumption compared to using many individual short pillars with additional spacing.
3Use of energy by moving object
If metal layer routing is optimized for power delivery, then power delivery efficiency improves, but heat generation and electromigration susceptibility increase
Solution Approach 1:
The patent utilizes the vertical dimension by extending pillar patterns into medium-length structures, creating additional spatial separation that allows for optimized routing paths. This dimensional approach enables better thermal management and electromigration mitigation while maintaining efficient power delivery through the metal layers.
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
This approach reduces consumption of routing resources, increases wiring density, and minimizes Joule heating by ensuring sufficient vertical-separation for transverse routing, thus enhancing the efficiency of power delivery and reducing electromigration issues.
Implementation Method 1
minimizes Joule heating by ensuring sufficient vertical-separation for transverse routing
Data Source
AI summary
A method of a layout diagram (of a conductive line structure for an IC) including: for a first set of pillar patterns included in an initial layout diagram that represents portions of an M(i) layer of metallization and where i is a non-negative number, the first set including first and second pillar patterns which are non-overlapping of each other, which have long axes that are substantially collinear with a reference line, and which have a first distance of separation, determining a first distance of separation as between corresponding immediately adjacent members of the first set; recognizing that the first distance is less than a transverse routing (TVR) separation threshold for an M(i+j) layer of metallization, where j is an integer and j≥2; and increasing the first distance so as to become a second distance which is greater than the TVR separation threshold of the M(i+j) layer.