Adaptive Load Current Control for Voltage Droop in Digital Loads
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Solution Overview
Problem
Digital circuits with adaptive clocking experience performance slowdown due to voltage droop, which existing correction methods fail to prevent effectively.
Innovation Solution
A control circuit that adjusts load current based on the magnitude of voltage difference and digital state of the load, using periodic and continuous sampling to anticipate and respond to current demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock frequency is reduced in response to detecting voltage droop, then voltage droop is corrected, but digital circuit performance is slowed
Solution Approach 1:
The control circuit monitors the digital state of the digital load and anticipates future current demands before voltage droop occurs. By proactively adjusting the current source output based on predicted load requirements, the system prevents voltage droop before it impacts performance, eliminating the need to reduce clock frequency for correction.
Solution Approach 2:
The system implements closed-loop feedback by continuously monitoring both the digital state of the load and the actual voltage levels. This feedback mechanism allows the control circuit to dynamically adjust the current source output to maintain stable voltage during high current demand periods, preventing performance degradation.
2Reliability
If current source output is increased to prevent voltage droop, then voltage stability is improved, but power consumption increases
Solution Approach 1:
The current source output is dynamically adjusted based on real-time digital state monitoring and voltage feedback. Rather than maintaining a constantly high current output, the system adapts the current level to match actual load requirements, ensuring voltage stability during high-demand periods while reducing power consumption during lower-demand periods.
Solution Approach 2:
The system changes the current output parameter of the current source based on monitored conditions. By adjusting the current level in response to digital state changes and voltage measurements, the system maintains voltage stability when needed while optimizing power consumption by reducing current when full power is not required.
Data Source
AI summary
A control circuit includes one or more processors and a computer readable medium storing instructions that, when executed by the one or more processors, cause the control circuit to perform functions. The functions include providing a load current that flows into a digital load and determining a magnitude of a difference between a load voltage across the digital load and a reference voltage. The functions also includes determining a digital state of the digital load and adjusting the load current based on (i) the magnitude of the difference between the load voltage and the reference voltage and (ii) the digital state of the digital load.