Variable Pitch Metal Segments for IC Routing Flexibility
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Solution Overview
Problem
Current IC layout diagram generation methods face limitations in routing flexibility and chip area utilization due to fixed pitch ratios between metal layers, which restricts the compact arrangement of layout features and increases design rule check violations.
Innovation Solution
The method involves arranging metal segments in multiple layers with varying pitches, specifically a third layer with a smaller pitch than the second layer, allowing for increased routing flexibility and improved chip area utilization by enabling more compact arrangements of layout features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed pitch ratios between metal layers are used, then manufacturing simplicity is maintained, but routing flexibility deteriorates
Solution Approach 1:
The patent changes the pitch parameter of metal layers from fixed ratios to variable ratios. Specifically, it sets the pitch of the third metal layer to be smaller than that of the second metal layer, breaking the traditional fixed pitch ratio convention. This parameter change enables more flexible routing paths and improves adaptability in IC layout design.
2Area of stationary object
If fixed pitch ratios between metal layers are used, then design rule check compliance is improved, but chip area utilization deteriorates
Solution Approach 1:
The patent modifies the pitch parameter of the third metal layer to be smaller than the second metal layer's pitch. This parameter change allows for more compact arrangement of layout features, increasing chip area utilization while still maintaining design rule compliance through controlled pitch reduction.
3Adaptability or versatility
If smaller pitch in third metal layer is implemented, then routing flexibility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by reducing the pitch only in the third metal layer where it is most needed for routing flexibility, while maintaining larger pitches in other layers. This localized pitch reduction optimizes routing capabilities in critical areas without unnecessarily complicating the entire manufacturing process.
Data Source
AI summary
An IC structure includes a first plurality of metal segments extending in a first metal layer in a first direction and having a first pitch in a second direction perpendicular to the first direction, a second plurality of metal segments extending in a second metal layer in the second direction and having a second pitch in the first direction, and a third plurality of metal segments extending in a third metal layer in the first direction and having a third pitch in the second direction. The second metal layer is a next consecutive layer overlying the first metal layer, the third metal layer is a next consecutive layer overlying the second metal layer, and a ratio of the second pitch to the third pitch is greater than one.