Adaptive Voltage Converter for Sub-Threshold Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sub-threshold and near-threshold circuits face exponential sensitivity to manufacturing process variations and operating temperature, leading to intolerable switching speed and power fluctuations, and require an adaptive voltage converter that can change power/performance characteristics between active and sleep modes.
Innovation Solution
An adaptive voltage converter is developed, which adjusts its output voltage based on process corners and temperature, using a combination of buck converters for high-efficiency active mode and linear regulators for low quiescent current sleep mode, with tuning parameters stored for dynamic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sub-threshold circuits operate at low voltage to reduce power consumption, then energy efficiency is improved, but switching speed and performance become highly sensitive to temperature and process variations
Solution Approach 1:
The voltage converter dynamically adjusts its output voltage based on real-time temperature and process conditions. The control circuit continuously monitors operating parameters and modifies the output voltage to maintain optimal circuit performance across varying conditions, transforming a static voltage supply into an adaptive system that responds to environmental changes
Solution Approach 2:
The system changes the output voltage parameter in response to temperature and process variations. By adjusting the voltage level dynamically, the converter compensates for the exponential sensitivity of sub-threshold circuits to environmental factors, maintaining reliable operation without requiring fixed voltage conditions
2Reliability
If adaptive voltage adjustment is implemented to maintain constant performance across temperature variations, then performance stability is improved, but device complexity increases
Solution Approach 1:
The voltage converter incorporates feedback mechanisms that monitor temperature and output voltage conditions. The control circuit uses this feedback information to automatically adjust the output voltage, creating a closed-loop system that maintains performance stability without requiring complex external control infrastructure
Solution Approach 2:
The control circuit is designed to handle multiple functions including temperature sensing, voltage regulation, and performance optimization within a single integrated unit. This multi-functional approach reduces overall system complexity by consolidating control functions rather than requiring separate dedicated circuits for each function
3Use of energy by moving object
If buck converters are used for high-efficiency active mode operation, then power efficiency is improved, but quiescent current increases making them unsuitable for sleep mode
Solution Approach 1:
The voltage converter dynamically switches between buck converter operation during active modes and linear regulator operation during sleep modes. This dynamic reconfiguration allows the system to optimize for power efficiency during high-performance periods while minimizing quiescent current consumption during low-power periods, adapting the power conversion topology to match operational requirements
4Use of energy by stationary object
If linear regulators are used for low quiescent current sleep mode, then power efficiency in sleep mode is improved, but overall power conversion efficiency decreases
Solution Approach 1:
The system periodically switches between different power conversion topologies based on operational mode requirements. During active periods, the buck converter provides high efficiency power conversion. During sleep periods, the linear regulator provides low quiescent current operation. This periodic switching between conversion modes optimizes overall system efficiency across the complete operational cycle
Data Source
AI summary
An adaptive voltage converter adapted to compensate for the exponential sensitivities of sub-threshold and near-threshold circuits. The converter can change its power/performance characteristics between different energy modes. The converter may comprise two or more voltage converters/regulators. A multiplexing circuit selects between the outputs of the several converters/regulators depending on the state of a control signal generated by a control facility. The converter is specially adapted to change the output of each converter/regulator based on a number of variables, including, for example, process corner, temperature and input voltage.