Diagonal Power Rail Layout for Lower IC Voltage Drop
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Solution Overview
Problem
As integration levels increase in integrated circuits, the limited degree of freedom in arranging power delivery network lines leads to inefficiencies in power distribution, resulting in voltage drops and reduced power integrity.
Innovation Solution
The implementation of diagonal power patterns with overlapping rectangular patches across multiple wiring layers, interconnected by vias, enhances power delivery efficiency and reduces voltage drops by providing a more flexible and robust power network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grid power delivery network is used in integrated circuits with high integration levels, then power can be supplied to multiple components, but the degree of freedom in arranging power lines is limited leading to voltage drops
Solution Approach 1:
The patent transitions from traditional orthogonal power line arrangements to diagonal power patterns that extend at 45-degree angles relative to the orthogonal grid. This dimensional change in the arrangement pattern provides additional spatial freedom for power delivery paths, allowing power to reach components more efficiently without conflicting with signal wiring constraints in high-density integrated circuits.
Solution Approach 2:
The patent introduces asymmetric diagonal power patterns that break the symmetry of traditional orthogonal grids. By arranging power lines at diagonal orientations rather than strict horizontal and vertical alignments, the design creates asymmetric pathways that optimize power delivery routes and reduce interference with signal lines while maintaining effective power distribution across the circuit.
2Productivity
If more wires are added to transmit signals in high integration level circuits, then signal transmission capability increases, but the degree of freedom in arranging power delivery network lines decreases
Solution Approach 1:
As signal wires fill the orthogonal grid spaces in high-integration circuits, the patent introduces diagonal power patterns that utilize the diagonal dimension for power delivery. This allows power lines to traverse through spaces not occupied by orthogonal signal wires, maintaining arrangement flexibility and adaptability even as signal transmission capability increases through added wiring.
3Ease of manufacture
If traditional orthogonal power patterns are used, then manufacturing is simple, but power delivery paths are longer causing voltage drops
Solution Approach 1:
The patent employs asymmetric diagonal power patterns that cut across the circuit at 45-degree angles, creating shorter power delivery paths compared to orthogonal routes that must follow the grid structure. This asymmetric arrangement reduces the distance power must travel to reach components, minimizing voltage drops while remaining compatible with standard semiconductor manufacturing processes.
Data Source
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AI summary
An integrated circuit includes a standard cell, a power rail extending in a first direction in a first wiring layer and configured to supply power to the standard cell, and an upper power pattern disposed in a second wiring layer above the first wiring layer. The upper power pattern includes a plurality of rectangular upper power patches extending in the first direction, and configured to supply power to the power rail. Corner portions of the plurality of upper power patches overlap each other in a direction between the first direction and a second direction that intersects the first direction.