IC Power Distribution via Virtual Islands
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Solution Overview
Problem
Integrated circuits (ICs) face performance limitations due to variations in semiconductor fabrication, leading to reduced performance in certain regions, which can result in increased scrap parts and costs, as existing design methodologies struggle to accurately model factors contributing to these variations, such as AC and DC draw, circuit timing, and supply voltage transients.
Innovation Solution
The IC is divided into regions with virtual power islands (VPIs) and a global power distribution structure, where vertical interconnects (VIs) and horizontal interconnects (HIs) are used to manage power distribution, allowing for localized supply voltage adjustments to enhance performance in reduced-performance regions, while maintaining overall power dissipation within manageable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IC is divided into regions with virtual power islands and localized supply voltage adjustments are implemented, then performance in reduced-performance regions is enhanced, but device complexity increases
Solution Approach 1:
The IC is divided into multiple regions, each with its own virtual power island (VPI) that can be independently powered. This segmentation allows localized voltage adjustments without affecting the entire chip, enabling performance enhancement in specific regions while maintaining manageable complexity through modular organization.
Solution Approach 2:
Different regions of the IC are provided with different supply voltages tailored to their specific performance requirements. Regions with reduced performance due to fabrication variations receive higher voltages to compensate, while well-performing regions maintain standard voltages, optimizing overall performance consistency without uniformly increasing complexity.
2Speed
If localized supply voltage adjustments are made to enhance performance in reduced-performance regions, then operating frequency is improved, but power dissipation increases
Solution Approach 1:
Instead of uniformly increasing voltage across the entire IC, voltage is selectively increased only in specific regions that require performance enhancement. This partial action approach achieves the necessary operating frequency improvements while minimizing overall power dissipation by limiting high-voltage operation to only where needed.
3Manufacturing precision
If existing design methodologies are used to model fabrication variations, then design process simplicity is maintained, but manufacturing precision deteriorates
Solution Approach 1:
The methodology performs preliminary timing estimates and identifies regions with reduced performance before finalizing the power distribution design. By proactively modeling fabrication variations and their impact on timing, the design process can pre-plan localized voltage adjustments, improving manufacturing precision without requiring complex post-fabrication modifications.
Solution Approach 2:
The approach uses timing estimation programs and circuit simulation programs to create virtual models of the IC's power distribution and timing behavior. These computational copies allow accurate prediction of fabrication variations and their effects on performance, enabling precise design adjustments before physical manufacturing without significantly increasing actual manufacturing complexity.
Data Source
AI summary
An integrated circuit (IC) can be configured to provide a managed power distribution to circuits within a plurality of regions of the IC. Each region of the plurality of regions can include a corresponding set of circuits that are electrically connected to a corresponding virtual power island (VPI) within said each region. A global power distribution structure within the IC can be configured to be electrically interconnected to an off-chip voltage supply. The IC can also include a plurality of sets of vertical interconnects (VIs), each set of VIs electrically interconnected to a VPI within a corresponding region. Each set of VIs can also be connected to the global power distribution structure, and can be used to provide a specifically managed voltage through a VPI to a set of circuits within a corresponding region of the IC.