Diagonal Via Layout for Uniform IC Spacing and Routing
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Solution Overview
Problem
Current integrated circuit (IC) manufacturing processes face challenges in achieving uniform via spacing and efficient routing due to the complexity of interconnect structures in miniaturized ICs, leading to reduced yields and increased manufacturing costs.
Innovation Solution
The implementation of a continuous diagonal via pattern in IC layout diagrams and photo masks, combined with metal rules applied to adjacent metal layers, restricts via region placement to alternating diagonal grid lines, enhancing pattern uniformity and routing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional interconnect routing methods are used in miniaturized ICs, then routing flexibility is maintained, but via spacing uniformity deteriorates and manufacturing yields decrease
Solution Approach 1:
The patent segments the via placement pattern into alternating diagonal grid lines, creating distinct first and second sets of diagonal lines. This segmentation enforces uniform via spacing by confining vias to specific diagonal paths, thereby improving manufacturing precision and yield in miniaturized ICs.
Solution Approach 2:
The patent employs asymmetric diagonal grid line arrangements where first and second sets of diagonal lines are oriented at different angles (e.g., 45 degrees and 135 degrees). This asymmetric pattern creates uniform via spacing while maintaining routing flexibility, resolving the contradiction between precision and productivity.
2Stability of the object's composition
If via regions are freely placed at metal layer intersections, then routing efficiency is maintained, but pattern uniformity deteriorates
Solution Approach 1:
The patent transitions from conventional orthogonal grid patterns to diagonal grid line patterns. By rotating the via placement framework to diagonal orientations, the patent achieves superior pattern uniformity while preserving routing efficiency, as diagonals provide more equitable spacing distribution across the metal layer intersections.
Solution Approach 2:
The patent applies different diagonal line orientations in different regions of the IC layout. First set diagonal lines and second set diagonal lines are selectively used based on local routing requirements, ensuring pattern uniformity is maintained while adapting to specific routing efficiency needs in different areas.
3Adaptability or versatility
If complex interconnect structures are used to provide flexible routing, then routing versatility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent creates a universal diagonal via pattern framework that serves multiple routing functions. The alternating diagonal grid lines provide a single standardized pattern that handles various routing scenarios, eliminating the need for multiple specialized interconnect structures and thereby reducing manufacturing complexity while maintaining versatility.
Data Source
AI summary
A method of generating an integrated circuit (IC) layout diagram includes obtaining a grid of intersecting first and second pluralities of tracks corresponding to adjacent metal layers, determining that first and second pitches of the respective first and second pluralities of tracks conform to a first rule, applying a via positioning pattern to the grid whereby via regions are restricted to alternating diagonal grid lines, positioning via regions at some or all of the grid intersections of the alternating diagonal grid lines, and generating the IC layout diagram including the via regions positioned along the alternating diagonal grid lines.