Processor Voltage Supply Control for DVFS Transient Droops
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Solution Overview
Problem
Existing voltage regulation systems for semiconductor devices face difficulties in responding effectively to transient voltage droops, especially when the desired voltage level changes dynamically, as they are often configured to operate with predetermined voltage targets and may not adapt quickly enough to sudden changes in power demand.
Innovation Solution
An active transient control block that uses low-pass filters and a voltage sensor array to detect voltage droops and automatically activate a higher voltage source supply, providing additional power to the load without prior knowledge of the processor's voltage target, allowing for sub-nanosecond response times and independence from dynamic voltage and frequency scaling implementations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuitry is preconfigured to account for transient voltage droops with fixed voltage margins, then reliable operation at a specific voltage level is achieved, but the system cannot adapt when the processor operates at different voltage levels
Solution Approach 1:
The patent implements dynamic voltage margin adjustment by monitoring the actual voltage level at the processor and automatically adapting the transient control parameters. The system transitions from static preconfigured margins to dynamic margins that adjust in real-time based on the processor's operating voltage, enabling reliable operation across multiple voltage levels while maintaining transient protection.
Solution Approach 2:
The system changes the voltage margin parameter dynamically based on the processor's operating conditions. By detecting the actual voltage level and adjusting the transient control parameters accordingly, the system maintains optimal protection against voltage droops while adapting to different operating modes, including DVFS scenarios where voltage levels change over time.
2Reliability
If transient control circuitry is designed with fixed response characteristics, then simple and predictable behavior is achieved, but the system cannot provide sub-nanosecond response times across varying voltage conditions
Solution Approach 1:
The patent implements dynamic response time adjustment by monitoring voltage droop severity and adapting the control response characteristics in real-time. The system uses multiple low-pass filters with different time constants to detect droops at different scales and activates appropriate correction mechanisms with optimally tuned response times, achieving sub-nanosecond response for severe droops while maintaining stability for minor fluctuations.
Solution Approach 2:
The transient control system is segmented into multiple detection stages with different response characteristics. By dividing the control function into separate detection and correction stages with optimized time constants, the system achieves fast response for critical droops while filtering out noise, thereby improving overall response time without sacrificing reliability.
3Reliability
If voltage margins are increased to account for transient droops, then reliable operation is ensured, but power consumption increases and operating frequency must be reduced
Solution Approach 1:
The patent implements dynamic voltage margin adjustment that reduces the voltage margin when transient droops are not detected, allowing the processor to operate at higher frequencies with lower power consumption. The system continuously monitors voltage stability and adapts the margin settings in real-time, maintaining high margins only when needed for transient protection, thereby improving overall productivity while ensuring reliability during actual transient events.
4Use of energy by moving object
If DVFS operations are implemented to dynamically change voltage levels, then power efficiency is improved, but preconfigured transient control circuitry cannot properly respond to voltage droops at differing voltage levels
Solution Approach 1:
The patent implements feedback mechanisms that continuously monitor the actual voltage level at the processor and use this information to adjust transient control parameters. The system detects voltage changes associated with DVFS operations and adapts its response characteristics accordingly, maintaining proper transient protection across all voltage levels while preserving the power efficiency benefits of dynamic voltage scaling.
Solution Approach 2:
The system dynamically changes transient control parameters based on the processor's operating voltage level. By detecting the current voltage setting and adjusting filter time constants, threshold levels, and control gain accordingly, the system maintains optimal transient protection across the full DVFS range, enabling compatibility with dynamic voltage scaling while preserving power efficiency.
Data Source
AI summary
Dedicated circuitry may monitor a processor supply voltage and provide additional power on a temporary nano-second scale basis to the processor when the supply voltage drops below predetermined levels. This may be done without explicit knowledge of a commanded supply voltage level for the processor.