Semiconductor Integrated Circuit Power Management via Dynamic Voltage Scaling
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Solution Overview
Problem
Semiconductor integrated circuits face increased power consumption due to rising leakage currents as MOS transistors are miniaturized, with existing methods like DVFS and PG offering limited superiority depending on operation temperature and fabrication conditions.
Innovation Solution
A semiconductor integrated circuit that includes a detecting circuit to calculate energy consumption for power gating and dynamic voltage and frequency scaling operations, and a switching circuit to dynamically select between these methods based on detected element characteristics, optimizing power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Power Gating method is used to reduce leakage current, then power consumption during standby is reduced, but operation current during active state is not reduced
Solution Approach 1:
The patent implements dynamic selection between Power Gating and DVFS methods based on real-time detection of element characteristics (threshold voltage, mobility) and operating conditions. The power management system transitions from static to dynamic operation by continuously monitoring transistor parameters and adapting the power reduction strategy accordingly, thereby optimizing both standby and active state power consumption without excessive complexity.
Solution Approach 2:
The patent changes operational parameters (power supply voltage, operation frequency) based on detected element characteristics. By adjusting voltage and frequency dynamically according to actual transistor performance, the system achieves effective power reduction while adapting to fabrication variations and aging effects, resolving the contradiction between simple power gating and complex adaptive management.
2Loss of energy
If DVFS method is used to reduce operation current, then power consumption during active state is reduced, but leakage current during standby is not reduced
Solution Approach 1:
The system dynamically adjusts power supply voltage and operation frequency based on detected element characteristics and task requirements. This dynamic adaptation allows the DVFS method to reduce operation current effectively while the system intelligently determines when to apply voltage/frequency scaling versus when to use power gating, managing complexity through adaptive decision-making rather than fixed complex control.
Solution Approach 2:
The patent incorporates feedback mechanisms where the detecting circuit continuously monitors element characteristics (threshold voltage, mobility) and provides information to the power management unit. This feedback loop enables the system to adjust voltage and frequency settings based on actual transistor performance, achieving effective operation current reduction while maintaining manageable complexity through information-driven control.
3Device complexity
If fixed power management method is used, then device complexity is reduced, but adaptability to different operation conditions and fabrication variations is poor
Solution Approach 1:
The patent transforms the power management system from static to dynamic by continuously detecting element characteristics and adapting the power reduction method accordingly. The system can switch between Power Gating and DVFS based on real-time conditions, achieving high adaptability to temperature variations and fabrication differences without requiring excessively complex fixed architecture.
Solution Approach 2:
The system changes operational parameters (voltage, frequency, power gating state) based on detected element characteristics such as threshold voltage and mobility. By adapting parameters to actual transistor performance, the system achieves versatility across different operating conditions and fabrication variations while maintaining reasonable complexity through parameter-driven adaptation rather than structural complexity.
4Productivity
If MOS transistors are miniaturized to increase integration density, then device functionality is improved, but leakage current increases exponentially
Solution Approach 1:
The patent changes operational parameters (power supply voltage, operation frequency) based on detected element characteristics of miniaturized transistors. By adapting voltage and frequency to the actual performance of scaled transistors, the system achieves effective power reduction while maintaining the benefits of high integration density enabled by miniaturization.
Solution Approach 2:
The detecting circuit provides feedback on element characteristics of miniaturized transistors, enabling the power management unit to select appropriate power reduction strategies. This feedback mechanism allows the system to combat leakage current in scaled devices by making informed decisions about when to apply power gating versus DVFS, thereby maintaining productivity while reducing energy loss.
Data Source
AI summary
A semiconductor integrated circuit includes: an internal circuit; a detecting circuit which detects an element characteristic of the internal circuit; a calculating circuit which calculates a first consumption energy consumed when a power gating operation is performed on a task processed by the internal circuit and a second consumption energy consumed when an operation of reducing a voltage and a frequency is performed in accordance with the element characteristic; and a switching circuit which performs the power gating operation on the internal circuit when the first consumption energy is smaller than the second consumption energy and performs the operation of reducing a voltage and a frequency when the second consumption energy is smaller than the first consumption energy.