Power Distribution Structure for Voltage Drop and Leakage Control
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Solution Overview
Problem
In the design of low power circuits, particularly in Application Specific Integrated Circuits (ASICs) and System on a Chip (SoC), existing technologies face challenges in optimizing voltage drop requirements without incurring excessive current leakage, especially in nanometer-scale designs where current leakage becomes a significant portion of the active power budget.
Innovation Solution
A power distribution structure with a selectable composition and placement of cells, including power gating cells, enable cells, and filler cells, utilizing Metal Oxide Semiconductor (MOS) device switches to dynamically power up or down logic blocks, optimizing voltage drop during active operation while minimizing leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a MOS device is made large enough to meet voltage drop requirements during active operation, then voltage drop is controlled, but current leakage increases significantly
Solution Approach 1:
The power distribution structure is segmented into multiple cell types (power gating cells, enable cells, filler cells) that can be selectively placed and configured. This segmentation allows different regions to have optimized characteristics - some cells prioritize voltage drop control while others minimize leakage, resolving the contradiction by distributing different functional responsibilities across multiple specialized components rather than relying on a single oversized MOS device
Solution Approach 2:
Different cell varieties within the power distribution structure have different local characteristics optimized for specific functions. Power gating cells are configured with specific ON-state resistance values for voltage drop control, while enable cells and filler cells are optimized for minimal leakage. This local quality differentiation allows the overall structure to simultaneously achieve both voltage drop control and leakage minimization in different locations
2Loss of energy
If current leakage is reduced by optimizing MOS device size, then power consumption decreases, but voltage drop during active operation increases
Solution Approach 1:
The invention merges multiple cell types (power gating cells, enable cells, filler cells) into a unified power distribution structure. This combination allows the system to achieve both low leakage and controlled voltage drop simultaneously - the power gating cells provide voltage control while enable cells and filler cells contribute to leakage reduction, creating a synergistic effect that neither component type could achieve alone
Solution Approach 2:
The power distribution structure employs dynamic cell selection and configuration, where different cell varieties can be activated or deactivated based on operational requirements. This dynamic approach allows the system to optimize between voltage drop control and leakage minimization in real-time, adjusting the effective resistance characteristics as needed for different operational states
3Device complexity
If a single power distribution structure is used for all circuits, then design complexity is reduced, but optimization for specific circuit requirements is lost
Solution Approach 1:
The power distribution structure is designed as a universal multi-functional system that can serve different circuit requirements through configurable cell selection and placement. The same basic structure type can be adapted to prioritize voltage drop control in some configurations and leakage minimization in others, providing versatility without requiring completely different structural designs for each application
Solution Approach 2:
The invention enables optimization for specific circuit requirements by changing parameters such as cell type selection, cell placement patterns, and resistance values rather than changing the fundamental structure. This parameter-based customization allows the same power distribution structure framework to be adapted to different circuit needs while maintaining overall design consistency and avoiding excessive complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for customized power management that balances voltage drop, leakage current, and performance, extending battery life and reducing heat generation in mobile devices by optimizing the composition and placement of power gating cells within the power distribution ring.
Implementation Method 1
utilizing Metal Oxide Semiconductor (MOS) device switches to dynamically power up or down logic blocks, optimizing voltage drop during active operation while minimizing leakage current
Data Source
AI summary
Various methods and apparatuses are described for a power distribution structure. In an embodiment, an integrated circuit contains power gating cells that each contain Metal Oxide Semiconductor (MOS) device switches located relative in the power distribution structure to power up and down a block of logic containing a plurality of individual cells using these MOS device switches. The MOS device switches can be tuned to requirements of a target block of logic in order to meet its optimal voltage drop requirements during its active operational state while minimizing leakage current in its off state.