Contiguous Power Switch Layout for Backside Power Distribution
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Solution Overview
Problem
The miniaturization of integrated circuits poses challenges in design and manufacturing, particularly in ensuring power efficiency and flexibility in routing due to strict specifications and reliability concerns, which existing EDA tools struggle to address effectively.
Innovation Solution
The integration of power switches with active regions forming a contiguous region, aligned in a specific direction, allows for improved power efficiency by increasing the area of backside metal rails and the number of via contacts, reducing resistances and enhancing routing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If power switches are miniaturized to reduce device size, then device dimensions are reduced, but routing flexibility and power efficiency deteriorate
Solution Approach 1:
The patent introduces backside metal rails as a third-dimensional power distribution pathway, allowing power to be delivered from the substrate backside rather than only through planar front-side routing. This vertical dimension addition enables independent routing paths that are not constrained by the two-dimensional layout, thereby maintaining routing flexibility despite device miniaturization.
Solution Approach 2:
The power distribution system is segmented into separate functional components: front-side power switches, backside metal rails, and via contacts connecting the two. This segmentation allows each component to be optimized independently - the backside rails can be designed for optimal power delivery while the front-side switches maintain compact routing, resolving the contradiction between size reduction and routing flexibility.
2Loss of energy
If backside metal rail area is increased to reduce resistance, then power efficiency is improved, but device area is increased
Solution Approach 1:
The backside metal rails are strategically positioned and sized according to local power delivery requirements. Rather than uniformly increasing rail area across the entire device, the rails are optimized locally at each power switch location, with dimensions and spacing adjusted to achieve target resistance values without unnecessarily increasing overall device area.
3Loss of energy
If via contacts are increased to reduce resistance, then power delivery is improved, but manufacturing complexity is increased
Solution Approach 1:
The via contacts are extracted as a distinct manufacturing layer, separated from both the front-side circuit fabrication and backside rail formation. This allows via placement and dimensions to be independently optimized for electrical performance without constraining the design of other components, while standard semiconductor fabrication processes handle the via creation, maintaining manufacturing feasibility.
Data Source
AI summary
Disclosed embodiments herein relate to an integrated circuit including power switches with active regions connected to form a contiguous region. In one aspect, the integrated circuit includes a first layer including a first metal rail extending in a first direction. In one aspect, the integrated circuit includes a second layer above the first layer along a second direction perpendicular to the first direction. The second layer may include active regions for power switches. In one aspect, the active regions of the power switches are connected to form a contiguous region extending in the first direction. The first metal rail may be electrically coupled to the active regions through via contacts. In one aspect, the integrated circuit includes a third layer above the second layer along the second direction. The third layer may include a second metal rail electrically coupled to some of the power switches through additional via contacts.