Circuit Cell Power Stub Layout for Compact IC Power Routing
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Solution Overview
Problem
The miniaturization of integrated circuits poses design and manufacturing challenges, particularly in ensuring reliable power distribution and efficient layout design, as existing methods struggle to optimize power stubs and routing tracks within the limited space of circuit cells.
Innovation Solution
The integration of power stubs in a first metal layer and power lines in a second metal layer, where the power stubs are designed to be shorter than the circuit cell dimensions, allowing for more compact and efficient power supply distribution, and the use of dummy gate-conductors and isolation regions to manage transistor connections and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power stubs are extended across multiple circuit cells to provide power distribution, then power supply coverage is improved, but cell height and layout complexity increase
Solution Approach 1:
The power distribution network is segmented into local power stubs confined within each circuit cell rather than using long continuous power lines across multiple cells. Each power stub is independently sized to extend only to the farthest transistor in its cell, dividing the power distribution function into cell-level segments that reduce overall power line length and layout complexity.
Solution Approach 2:
Power stubs are positioned in the horizontal plane within each cell rather than extending vertically across cell boundaries. This dimensional reorganization keeps power distribution paths short and localized, improving power supply coverage reliability without increasing cell height or vertical layout complexity.
2Reliability
If power stubs are made longer to reach distant transistors, then power distribution reach is improved, but manufacturing precision and reliability deteriorate due to increased variability
Solution Approach 1:
Each power stub is locally optimized to extend only to the farthest transistor within its specific circuit cell, rather than using a uniform long length for all power lines. This local adaptation ensures adequate power distribution reach for each cell's specific transistor layout while keeping individual stub lengths short and manufacturable with high precision.
Solution Approach 2:
The power stub length parameter is changed from a fixed long value to a variable short value that adapts to each cell's specific requirements. By adjusting the length parameter locally based on the farthest transistor position in each cell, the design achieves sufficient power distribution reach while maintaining manufacturing precision through shorter, more controllable dimensions.
3Reliability
If power lines are routed across multiple circuit cells, then power supply coverage is improved, but routing complexity and manufacturing difficulty increase
Solution Approach 1:
The power distribution routing is segmented into cell-local power stubs rather than using continuous multi-cell power lines. Each stub is independently routed within its cell boundaries to the farthest transistor, dividing the complex multi-cell routing problem into simpler cell-level routing tasks that reduce overall routing complexity and manufacturing difficulty.
Solution Approach 2:
The power distribution function is extracted from the multi-cell routing domain and reorganized into local cell-level power stubs. This extraction removes the complexity of coordinating power routing across multiple cells and their boundaries, simplifying the routing design while maintaining adequate power supply coverage through localized stub extensions.
Data Source
AI summary
An integrated circuit includes a first-type active-region structure and a second-type active-region structure extending in a first direction and a first terminal-conductor and a second terminal-conductor extending in a second direction. The integrated circuit also includes a first power stub and a second power stub in a first metal layer and a first power line and a second power line in a second metal layer. The integrated circuit further includes a first via connector directly connected between the first power stub and the first terminal-conductor, a second via connector directly connected between the second power stub and the second terminal-conductor, a third via connector directly connected between the first power stub and the first power line, and a fourth via connector directly connected between the second power stub and the second power line.