Semiconductor Cell Active-Zone Offset for Flexible Routing
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) leads to restricted layout design rules for horizontal routing tracks and via connectors, limiting the number of available tracks and connector positions due to strict design rule restrictions, especially when p-type and n-type active zones are not offset, resulting in design rule violations.
Innovation Solution
Introducing an offset between p-type and n-type active zones, allowing for increased flexibility in routing by relaxing design rule restrictions on via connector positions, thereby enabling more routing options and reducing cell width in semiconductor cell structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If p-type and n-type active zones are aligned without offset, then manufacturing simplicity is maintained, but routing flexibility deteriorates due to design rule restrictions on via connector positions
Solution Approach 1:
The patent applies asymmetry by intentionally offsetting the p-type and n-type active zones from perfect alignment. This asymmetric positioning creates non-overlapping regions that provide additional space for via connectors and routing tracks, thereby improving routing flexibility while maintaining manufacturing feasibility through controlled offset distances
2Adaptability or versatility
If active zones are offset to increase routing flexibility, then via connector positioning options improve, but manufacturing precision requirements worsen due to tighter design rule restrictions
Solution Approach 1:
The patent employs parameter changes by systematically varying the offset distance between p-type and n-type active zones. By optimizing this parameter within specific ranges, the design achieves sufficient routing flexibility while maintaining compliance with manufacturing design rules, thus balancing via connector positioning options with manufacturing precision requirements
3Length of moving object
If cell width is reduced for miniaturization, then IC size decreases, but routing track availability worsens due to limited space for horizontal routing tracks
Solution Approach 1:
The patent applies dimensionality change by utilizing the vertical dimension (offset direction) to create additional routing space. By offsetting active zones vertically, the invention generates non-overlapping regions that accommodate via connectors and routing tracks without increasing cell width, thus maintaining miniaturization while improving routing track availability
Data Source
AI summary
A semiconductor cell structure includes first-type transistors aligned within a first-type active zone, second-type transistors aligned within a second-type active zone, a first power rail and a second power rail. Each of the first-type active zone and the second-type active zone is between a first alignment boundary and a second alignment boundary extending in a first direction which is perpendicular to a second direction. A first distance along the second direction between the long edge of the first power rail and the first alignment boundary of the first-type active zone is different from a second distance along the second direction between the long edge of the second power rail and the first alignment boundary of the second-type active zone by a predetermined distance.