Switch Cell Power Rail Layout to Ease IC Routing Congestion
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Solution Overview
Problem
In integrated circuits, the complexity of configuration and reduced dimensions of semiconductor devices lead to challenges in efficiently distributing power supply voltages, particularly in arranging power line patterns to minimize congestion and enhance integration density.
Innovation Solution
The integration circuit design includes a switch cell area with a power line providing a global power supply voltage, alternately arranged with first and second power rails, and utilizes P-type transistors connected to these rails, along with a power tap cell and switch dummy cell to efficiently manage power distribution and reduce routing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power line patterns are arranged to supply power to integrated circuit devices, then power distribution is achieved, but routing congestion increases and integration density decreases
Solution Approach 1:
The power distribution network is segmented into multiple independent power rails (first power rails and second power rails) that are alternately arranged. Each power rail can be independently routed and controlled, allowing power to be distributed to different regions without requiring a single congested power line. This segmentation reduces routing congestion while maintaining reliable power distribution.
Solution Approach 2:
The patent transitions from traditional two-dimensional power line routing to a three-dimensional power distribution architecture by utilizing alternating layers of first and second power rails. This multi-layer arrangement allows power to be delivered through vertical stacking rather than horizontal routing, reducing congestion in the planar routing layer and improving integration density.
2Reliability
If more power lines and transistors are added to improve power distribution, then power supply reliability improves, but area required increases and integration density decreases
Solution Approach 1:
The first power rails and second power rails are merged into an alternating pattern where they share common routing resources and control structures. This merging allows the circuit to achieve enhanced power supply reliability through multiple redundant paths without proportionally increasing the total area, as the power rails share infrastructure rather than requiring separate dedicated spaces.
Solution Approach 2:
The alternating power rail structure serves multiple functions simultaneously: it provides power distribution, acts as a routing framework for signal lines, and creates a scalable template for adding additional power rails. This multi-functionality reduces the need for additional dedicated area for power distribution while maintaining or improving power supply reliability.
Data Source
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AI summary
An integrated circuit includes: a plurality of first power rails extending in a first horizontal direction and configured to provide a first power supply voltage that is applied thereto; a plurality of second power rails extending in the first horizontal direction and configured to provide a second power supply voltage that is applied thereto; and a power line in a switch cell area and extending in the first horizontal direction the power line being configured to provide a global power supply voltage that is applied thereto, wherein the plurality of first power rails and the plurality of second power rails are alternately arranged in a second horizontal direction vertical to the first horizontal direction, wherein the plurality of first power rails, the plurality of second power rails, and the power line form a front-side pattern on a same layer, and wherein the power line is provided between two second power rails adjacent to each other in the first horizontal direction, among the plurality of second power rails.