IC Voltage Calibration Using Propagation Delay Feedback
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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 minimize power consumption can lead to incorrect operation, and existing methods struggle to balance power management with thermal and manufacturing variations.
Innovation Solution
An integrated circuit with a self-calibration unit and local power manager that iteratively tests supply voltage magnitudes to determine the lowest voltage for correct operation, adjusting voltage dynamically based on measured propagation delays through series-connected logic gates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If supply voltage is reduced to minimize power consumption, then power consumption decreases, but operation correctness deteriorates
Solution Approach 1:
The patent implements dynamic voltage adjustment by iteratively testing different supply voltage magnitudes and selecting the lowest voltage that maintains correct circuit operation. This dynamic approach replaces static voltage specification with adaptive voltage selection, allowing the system to operate at optimal power consumption while ensuring reliability through automated verification testing.
Solution Approach 2:
The patent employs self-calibration units and automated testing mechanisms that perform self-verification of circuit operation at different voltage levels. The system automatically determines the minimum adequate supply voltage through iterative testing without requiring external intervention, enabling the circuit to self-optimize its power consumption while maintaining correctness.
2Reliability
If supply voltage is statically specified to ensure correct operation across all variations, then operation correctness is maintained, but power consumption increases
Solution Approach 1:
The patent changes the supply voltage parameter dynamically based on actual circuit performance rather than using a fixed static value. By iteratively adjusting the voltage magnitude and verifying operation correctness at each level, the system identifies the minimum adequate voltage for each specific circuit instance, thereby reducing power consumption while maintaining reliability.
Solution Approach 2:
The patent performs preliminary iterative testing and self-calibration to determine the minimum adequate supply voltage before normal operation begins. This preliminary characterization allows the system to establish optimized voltage settings in advance, avoiding the need to use conservative static voltage specifications during actual operation.
3Reliability
If manufacturing process variations and temperature variations are accounted for with static voltage specification, then operation correctness is ensured, but power consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where the actual operation correctness is measured and used to adjust the supply voltage setting. Through iterative testing that verifies circuit operation at different voltage levels, the system receives feedback on actual performance and adjusts voltage accordingly, replacing the need for static voltage margins that account for variations in advance.
4Use of energy by moving object
If self-calibration testing is performed to determine minimum adequate supply voltage, then power consumption is optimized, but test time increases
Solution Approach 1:
The patent performs iterative testing at progressively lower voltage levels until the minimum adequate voltage is found. Rather than exhaustive testing at all possible voltage points, the method uses targeted iterative testing that stops once the threshold is identified, balancing thoroughness with efficiency to optimize the trade-off between accuracy and test time.
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.