Self-Calibrated Voltage Control for IC Delay and Power Balance
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Solution Overview
Problem
As integrated circuits with increasing transistor count 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 logic circuit, a local power manager, and a self-calibration unit that iteratively tests supply voltage magnitudes to determine the lowest voltage for correct operation, adjusting the supply voltage dynamically based on measured propagation delays through series-connected 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 operation correctness deteriorates
Solution Approach 1:
The patent implements dynamic voltage adjustment by allowing the supply voltage to vary over time based on actual operating conditions. The system transitions from static voltage specification to dynamic voltage control, where the voltage is adjusted according to measured propagation delays and actual circuit performance, enabling the circuit to operate correctly at lower voltages when conditions permit.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on process variations and temperature conditions. By measuring propagation delays and comparing them against thresholds, the system adjusts the supply voltage parameter to maintain correct operation while minimizing power consumption, adapting to different manufacturing variations and environmental conditions.
2Reliability
If supply voltage is increased to ensure correct operation across all variations, then operation correctness is maintained, but power consumption increases
Solution Approach 1:
The patent implements self-calibration where the integrated circuit automatically measures its own propagation delays and determines the minimum required voltage without external intervention. The self-calibration unit performs tests internally and adjusts the voltage accordingly, eliminating the need for conservative static voltage specifications while ensuring correct operation.
Solution Approach 2:
The system uses feedback from propagation delay measurements to adjust the supply voltage. The self-calibration unit measures actual circuit performance and uses this information to determine the appropriate voltage level, creating a closed-loop control system that optimizes power consumption while maintaining reliability.
3Reliability
If static voltage specification is used to ensure correct operation, then manufacturing variations are covered, but power optimization is limited
Solution Approach 1:
The patent performs preliminary self-calibration during manufacturing or initialization to characterize each individual circuit's voltage requirements. The self-calibration unit executes tests and stores calibration data that reflects the specific circuit's behavior, enabling subsequent operation at optimized voltage levels tailored to that particular device's characteristics.
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.