Adaptive Voltage Scaling Circuitry for Power Optimization
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in optimizing operating speed and power consumption due to process variations, supply voltage, and temperature, with dynamic voltage scaling methods often resulting in high power consumption and inefficiency, especially at smaller geometries like 28 nm where leakage current dominates.
Innovation Solution
The implementation of an adaptive voltage scaling (AVS) circuitry that includes a test circuit and controller to dynamically adjust the supply voltage based on the operation of a test signal, allowing for optimal power management by setting a threshold failure voltage and adjusting the main supply voltage accordingly to ensure proper operation while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dynamic voltage scaling is used to counteract temperature effects, then operating speed is maintained, but power consumption increases due to high supply voltage settings
Solution Approach 1:
The patent measures process speed during IC testing at nominal conditions and stores these values in fuses before operation. This preliminary characterization allows the system to later dynamically scale voltage based on pre-determined process speed and temperature data, avoiding the need for wide safety margins that would otherwise require higher voltage settings and increased power consumption.
Solution Approach 2:
The system dynamically changes the supply voltage parameter based on measured process speed and operating temperature. By adjusting voltage according to actual PVT conditions rather than using fixed high-voltage settings, the system maintains operating speed while reducing power consumption, particularly the exponentially increasing leakage power at smaller geometries.
2Reliability
If high supply voltage is used to ensure slow process IC meets timing requirements, then timing requirements are met, but power consumption increases due to higher current draw
Solution Approach 1:
Process speed is measured and characterized during manufacturing testing, and these preliminary measurements are stored in fuses. This allows the system to later determine the appropriate voltage level needed for timing compliance based on actual process characteristics rather than using conservative high-voltage settings for all devices, thereby reducing power consumption while ensuring timing requirements are met.
Solution Approach 2:
The system applies different voltage levels to different ICs based on their individual process characteristics stored in fuses. Each IC receives a customized voltage setting appropriate to its specific process speed and temperature conditions, rather than using a uniform high-voltage setting for all devices, which reduces overall power consumption while maintaining timing compliance for each individual device.
Data Source
AI summary
A circuit may include a first voltage regulator to supply a main circuit and a second voltage regulator to supply a test circuit. The test circuit may produce a test signal having a characteristic dependent on the second regulated supply voltage. A controller may adjust second voltage regulator to a threshold level to induce a change in the characteristic of the test signal. The controller may adjust the first voltage regulator based on the threshold level of the second regulated supply voltage.