Resonance-Aware DVFS Control for Voltage Droop Stability
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Solution Overview
Problem
As computing systems, such as mobile devices, become miniaturized, power management becomes increasingly complex due to the rise in the number of cores and IP devices, leading to challenges in efficiently managing power consumption and voltage stability, particularly during voltage drooping.
Innovation Solution
A Dynamic Voltage and Frequency Scaling (DVFS) controller is implemented, which calculates a resonance frequency from the dynamic characteristics of the power system, including a power management unit (PMU) and a clock management unit (CMU), to optimize performance and maintain stable low-power operation by adjusting the operating voltage and frequency based on feedback signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of cores and IP devices is increased to improve performance, then processing capability is improved, but power management complexity and voltage stability deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the DVFS controller continuously monitors voltage levels and power consumption from multiple cores and IP devices, then dynamically adjusts operating frequencies and voltages to maintain stability while managing complexity through centralized control
Solution Approach 2:
The system dynamically changes operating parameters (frequency and voltage) of different cores and IP devices based on real-time power consumption patterns and performance requirements, allowing selective optimization without uniformly increasing complexity across the entire system
2Speed
If operating voltage is increased to improve performance, then processing speed is improved, but power consumption and voltage drooping worsen
Solution Approach 1:
The patent employs dynamic voltage and frequency scaling (DVFS) that continuously adjusts operating voltage and frequency based on real-time performance requirements and power constraints, transitioning from static high-voltage operation to adaptive dynamic control that maintains speed when needed while reducing power consumption during lower-demand periods
Solution Approach 2:
The DVFS controller periodically monitors system state and adjusts voltage/frequency settings in controlled cycles, preventing continuous high-power consumption while ensuring performance is maintained when required, thus reducing overall power usage and voltage drooping effects
3Use of energy by moving object
If frequency scaling is used to manage power, then power consumption is reduced, but voltage stability and performance optimization worsen without considering system resonance
Solution Approach 1:
The patent performs preliminary characterization of the power system's frequency response and identifies resonance frequencies before normal operation, then uses this pre-acquired knowledge to guide DVFS decisions and avoid operating conditions that would excite resonant modes and cause voltage instability
Solution Approach 2:
The system implements closed-loop feedback that monitors voltage stability and power consumption, using real-time measurements to adjust frequency and voltage settings while considering the pre-characterized resonance characteristics, thus maintaining stability while achieving power savings
Data Source
AI summary
A Dynamic Voltage and Frequency Scaling (DVFS) controller, an integrated circuit including DVFS, and a method of operating the DVFS controller are provided. The integrated circuit includes at least one subblock circuit configured to process an instruction, and a DVFS controller configured to control a power management unit (PMU) and a clock management unit (CMU) to control an operating voltage and an operating frequency, respectively, based on a resonance frequency calculated from a frequency response resulting from dynamic characteristics of an entire power system including the PMU, a power delivery network (PDN), and the subblock circuit.