Self-Calibrated Voltage Management for IC Power-Delay Control
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Solution Overview
Problem
As integrated circuits with increasing transistor density and operating frequency face challenges in managing power consumption, reducing supply voltage to lower power consumption can lead to incorrect operation, and leakage currents become a significant issue with advanced process nodes, making it difficult to balance power management with performance and thermal requirements.
Innovation Solution
An integrated circuit with a self-calibration unit and local power manager that iteratively tests supply voltage levels until a test fails, determining the lowest stable voltage for operation, and adjusts the supply voltage dynamically based on measured propagation delays through a series of logic gates to optimize power consumption and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If supply voltage is reduced to lower power consumption, then power consumption decreases, but correct operation cannot be ensured
Solution Approach 1:
The patent implements dynamic voltage adjustment by introducing a self-calibration unit that iteratively tests different voltage levels and a local power manager that dynamically adjusts the supply voltage based on test results. This transforms the static voltage specification into a dynamic adaptation process, allowing the system to find the lowest voltage that ensures correct operation for each specific integrated circuit instance.
Solution Approach 2:
The patent changes the supply voltage parameter dynamically through iterative testing at respectively lower requested supply voltage magnitudes. The self-calibration unit modifies the voltage parameter in steps, testing at each level until the test fails, thereby identifying the optimal voltage threshold that balances power consumption with operational correctness.
2Use of energy by moving object
If supply voltage is reduced to lower power consumption, then power consumption decreases, but performance is reduced
Solution Approach 1:
The system dynamically adjusts voltage to the minimum level required for correct operation, thereby optimizing the performance-power consumption tradeoff. By iteratively testing and identifying the threshold voltage, the system ensures performance is maintained at the lowest possible power consumption level rather than using a conservative static voltage specification.
3Reliability
If static supply voltage specification is used across all variations, then manufacturing variations are covered, but power consumption cannot be optimized
Solution Approach 1:
The integrated circuit performs self-calibration by including a self-calibration unit that tests the specific circuit instance and determines its own optimal voltage threshold. This self-service approach allows each circuit to identify its unique characteristics and operate at the minimum voltage required for its specific manufacturing variations, rather than relying on conservative static specifications.
Solution Approach 2:
The system implements feedback through iterative testing where the self-calibration unit tests the logic circuit at different voltage levels and uses the test results to determine the optimal voltage. This feedback loop enables the system to adapt to manufacturing variations and temperature conditions, optimizing power consumption while ensuring correct operation.
4Quantity of substance
If advanced process nodes are used to increase transistor density, then transistor density increases, but leakage current increases
Solution Approach 1:
The patent changes the supply voltage parameter dynamically to compensate for increased leakage current in advanced process nodes. By iteratively testing and identifying the minimum voltage required for correct operation, the system reduces the voltage headroom that drives leakage current, thereby mitigating the leakage penalty associated with higher transistor density in advanced nodes.
Data Source
AI summary
In one embodiment, an integrated circuit includes a self calibration unit configured to iterate a test on a logic circuit in the integrated circuit at respectively lower supply voltage magnitudes until the test fails. A lowest supply voltage magnitude at which the test passes is used to generate a requested supply voltage magnitude for the integrated circuit. In an embodiment, an integrated circuit includes a series connection of logic gates physically distributed over an area of the integrated circuit, and a measurement unit configured to launch a logical transition into the series and detect a corresponding transition at the output of the series. The amount of time between the launch and the detection is used to request a supply voltage magnitude for the integrated circuit.