Local Power Block Circuit for Leakage Control in Mixed-Frequency Logic
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Solution Overview
Problem
Conventional methods for reducing leakage current in circuit design, such as using global headers or footers, are costly, complex, and degrade performance by increasing resistance and requiring additional control signals, making them undesirable for maintaining efficiency and performance, especially in low power battery-powered devices.
Innovation Solution
Implementing a local power block in circuits to decouple inactive portions, using pre-existing control signals to manage power supply, thereby reducing leakage without affecting the performance of active high-frequency components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a global header or footer is added to block leakage current, then leakage current is reduced, but device complexity and area increase
Solution Approach 1:
The patent divides the circuit into multiple activity detection units, each responsible for a specific portion of the circuit. Instead of using a single global header/footer for the entire circuit, separate power blocking mechanisms are implemented locally for each segment that can be independently controlled based on its activity state, thereby reducing overall complexity while maintaining leakage reduction benefits
Solution Approach 2:
The patent applies power blocking selectively to specific low-activity circuit portions rather than globally across the entire circuit. By using activity detection to identify which segments require leakage reduction and applying blocking only to those segments, the solution reduces leakage current without unnecessarily increasing the complexity of high-performance circuit areas
2Loss of energy
If a global header or footer is added to block leakage current, then leakage current is reduced, but area occupied increases
Solution Approach 1:
The patent implements separate power blocking for each circuit segment rather than a single global blocking structure. This segmentation allows each blocking mechanism to be sized appropriately for its specific segment's leakage requirements, avoiding the excessive area that would be needed for a global header/footer designed to handle the entire circuit's maximum current
Solution Approach 2:
The patent uses dynamic activity detection to control power blocking on-demand. The blocking structures are only activated when their corresponding circuit segments are in low-activity states, allowing the circuit area to be efficiently utilized without permanent occupation by large blocking structures that would be required in static designs
3Loss of energy
If conventional power blocking is used, then leakage current is reduced, but performance of high-frequency circuitry degrades
Solution Approach 1:
The patent separates high-frequency and low-frequency circuit portions with different power management strategies. High-frequency portions are excluded from power blocking and maintain direct power supply paths to preserve performance, while only low-activity portions undergo leakage reduction through activity-based power blocking
Solution Approach 2:
The patent applies different quality characteristics to different circuit segments: high-frequency segments maintain low-resistance power paths for optimal performance, while low-activity segments implement dynamic power blocking for leakage reduction. This local differentiation ensures that performance-critical areas are not degraded by leakage reduction mechanisms
4Loss of energy
If additional control signals are added for power blocking, then leakage current is reduced, but device complexity increases
Solution Approach 1:
The patent uses existing activity detection signals that already exist in the circuit for their primary purpose of controlling circuit operation, and repurposes them to also control power blocking. This multi-functionality eliminates the need for separate dedicated control signals for power blocking, reducing overall control signal complexity while maintaining effective leakage reduction
Data Source
AI summary
A circuit having a local power block for leakage reduction is disclosed. The circuit has a first portion and a second portion. The first portion is configured to operate at a substantially greater operating frequency than the operating frequency of the second portion. The second portion has a local power block configured to decouple the second portion if the second portion is inactive to reduce leakage current associated with the second portion without sacrificing performance of the first portion.