Flexible Metal Track Layout for Integrated Circuit Yield
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Solution Overview
Problem
The semiconductor industry faces challenges in manufacturing integrated circuits with increasingly complex designs and finer features, where traditional layout patterns and manufacturing processes struggle to maintain efficiency and yield due to fixed pitch constraints, leading to limitations in the manufacturing process window and yield rate.
Innovation Solution
The implementation of a flexible design for metal tracks with varying pitches and widths in integrated circuit structures, allowing for adjustments in metal via and contact positions, which enhances the manufacturing process window and improves yield rates by providing a larger tolerance for manufacturing variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed pitch layout patterns are used for metal tracks, then manufacturing process is simpler, but manufacturing process window and yield rate are limited
Solution Approach 1:
The patent applies dynamics by transitioning from fixed pitch layouts to flexible pitch layouts where metal track pitches and widths can be dynamically adjusted. This allows the manufacturing process to adapt to variations and optimize for yield, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The invention changes the parameters of metal track geometry (pitch and width) from fixed values to variable values. By allowing these parameters to be adjusted based on manufacturing requirements and variations, the patent improves yield rate while managing the complexity through systematic parameter optimization.
2Productivity
If metal track pitch is reduced to increase functional density, then more devices fit on chip area, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by allowing different metal track pitches in different regions of the circuit layout. Instead of uniformly reducing pitch everywhere, the flexible pitch layout allows critical areas to maintain larger pitches for manufacturing precision while non-critical areas can have reduced pitches to increase functional density.
3Ease of manufacture
If flexible pitch and width variations are implemented for metal tracks, then manufacturing process window enlarges and yield rate increases, but layout design complexity increases
Solution Approach 1:
The patent makes the layout design dynamic by allowing pitch and width variations in metal tracks. This dynamic approach enlarges the manufacturing process window and improves ease of manufacture by providing flexibility to accommodate process variations, while the systematic nature of the flexible pitch methodology manages the layout design complexity.
Data Source
AI summary
An integrated circuit structure is provided including a first transistor, a second transistor, a power rail, a first metal via and a plurality of metal tracks. The first transistor includes a first fin above a substrate and a source feature. The second transistor includes a second fin and a drain feature. The power rail is formed between the first fin and the second fin and below the source feature and the drain feature. The first metal via is formed over the power rail and electrically connected to source or drain feature. The metal tracks are separated from each other. Gaps between any two adjacent metal tracks are identical to each other, each of the metal tracks overlapping the power rail has a first width, each of the metal tracks not overlapping the power rail has a second width, and the first width is greater than the second width.