IC Cell Power Via Layout for High Density and Rule Compliance
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Solution Overview
Problem
The existing design rules for integrated circuits often result in inefficient layouts due to the requirement for a minimum distance between power and contact vias, leading to delays and less space-efficient designs, as violations of these rules necessitate redesign and can cause issues like short circuits and electromigration.
Innovation Solution
The introduction of a power conductive line that allows power vias to be positioned at different tracks than contact vias, ensuring compliance with minimum distance design rules while minimizing electromigration and IR drop, by enabling shorter cell heights and maximizing power via connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power vias and contact vias are positioned at the same track to simplify layout, then layout complexity is reduced, but the minimum distance design rule is violated causing short circuits and electromigration
Solution Approach 1:
The patent separates power vias and contact vias into different tracks (spatial dimension), allowing them to be positioned at different horizontal locations while maintaining vertical alignment. This dimensional separation resolves the contradiction by enabling both simplified layout (same vertical track alignment) and rule compliance (different horizontal positions preventing short circuits).
Solution Approach 2:
The patent divides the via structure into separate power vias and contact vias located at different tracks, rather than combining them at the same location. This segmentation allows independent positioning of power and signal connections, preventing electromigration and short circuits while maintaining layout efficiency through systematic arrangement.
2Reliability
If minimum distance between power and contact vias is enforced to prevent electromigration, then reliability is improved, but cell area increases reducing cell density
Solution Approach 1:
By positioning power vias and contact vias at different tracks (horizontal separation) rather than requiring vertical separation, the patent prevents electromigration without increasing cell area. The different track arrangement provides the necessary spatial separation to prevent harmful effects while maintaining compact cell dimensions.
Solution Approach 2:
The patent applies different track assignments locally - power vias at one track, contact vias at another - creating localized quality differences that prevent electromigration only where needed (at via locations) without affecting the overall cell area or requiring global spacing increases.
3Productivity
If power vias are positioned at the same track as contact vias to maximize power via connections, then power delivery efficiency is improved, but design rule violations occur causing redesign delays
Solution Approach 1:
The patent achieves maximum power via connections by utilizing different tracks horizontally, allowing multiple power vias to be connected efficiently without violating design rules. This dimensional approach enables high connection efficiency while ensuring first-time design success without redesign delays.
4Area of moving object
If cell height is reduced to increase cell density, then area efficiency is improved, but power and contact via placement becomes more constrained
Solution Approach 1:
By moving via placement constraints from the vertical dimension (same track) to the horizontal dimension (different tracks), the patent enables reduced cell height without increasing via placement complexity. The different track arrangement provides inherent separation that simplifies placement decisions even in compact cells.
Data Source
AI summary
An integrated circuit includes a cell that is between a substrate and a supply conductive line and that includes a source region, a contact conductive line, a power conductive line, and a power via. The contact conductive line extends from the source region. The power conductive line is coupled to the contact conductive line. The power via interconnects the supply conductive line and the power conductive line.