Tap Cell Layout for Congestion-Aware IC Latch-Up Prevention
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Solution Overview
Problem
The existing methods for designing integrated circuits (ICs) face challenges in efficiently disposing tap cells and managing routing congestion, which can lead to issues like latch-up phenomena and inefficient use of space.
Innovation Solution
The IC design includes a multi-row cell structure with varied tap cell placements and staggered arrangements of tap cells and switch cells, along with efficient routing to minimize congestion and prevent latch-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If tap cells are arranged in a regular grid pattern, then layout simplicity is maintained, but routing congestion increases and space utilization decreases
Solution Approach 1:
The patent applies asymmetry by arranging tap cells in non-uniform columns with different spacing distances. The first column of tap cells is spaced at a first distance from the second column, while the third column is spaced at a second distance from the second column, where the first and second distances are different. This asymmetric arrangement optimizes routing paths and reduces congestion compared to a regular grid pattern.
Solution Approach 2:
The patent utilizes staggered row positioning across multiple columns to create a two-dimensional optimization pattern. Tap cells in different columns are positioned in different rows, creating a staggered arrangement that opens up routing channels and improves space utilization while maintaining layout manageability.
2Area of stationary object
If tap cells are placed closer together to save space, then area utilization improves, but latch-up risk increases
Solution Approach 1:
The patent applies local quality by implementing different spacing strategies in different regions. The first distance between the first and second columns differs from the second distance between the second and third columns. This allows optimal spacing to be applied locally in each region, balancing space utilization with latch-up prevention based on specific routing requirements in each area.
Solution Approach 2:
The patent segments the tap cell arrangement into multiple columns with different spacing characteristics. By dividing the tap cell structure into distinct columns (first, second, third columns) with different inter-column distances, the design can optimize for both compactness and reliability in different segments simultaneously.
3Adaptability or versatility
If multi-row cells are used to increase functionality, then device capability improves, but routing congestion worsens
Solution Approach 1:
The patent performs preliminary action by pre-positioning tap cells in specific columns and rows before final cell placement. The staggered arrangement of tap cells across multiple columns creates predetermined routing channels that guide subsequent cell placement and routing operations, preventing congestion before it occurs.
Data Source
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AI summary
An integrated circuit (IC) includes a plurality of first tap cells arranged in a first column, and a plurality of second tap cells arranged in a second column and disposed in a row different from a row in which the plurality of first tap cells are disposed. The second column is adjacent to the first column in a first direction and spaced apart from the first column by a first distance. The IC includes a plurality of third tap cells arranged in a third column and disposed in a row different from the row in which the plurality of first tap cells are disposed and different from the row in which the plurality of second tap cells are disposed. The third column is adjacent to the first column in the first direction and spaced apart from the first column by a second distance that is different from the first distance.