Adaptive Voltage Converter for Sub-Threshold Energy Mode Switching
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Solution Overview
Problem
Sub-threshold and near-threshold circuits face significant challenges due to exponential sensitivity to manufacturing process variations and temperature, leading to intolerable switching speed and power fluctuations, and require a voltage converter that can adapt to different energy modes.
Innovation Solution
An adaptive voltage converter that adjusts its power/performance characteristics between active and sleep modes, using a buck converter for high-efficiency operation in active mode and a linear voltage regulator for ultra-low quiescent current in sleep mode, with dynamic tuning parameters to compensate for process and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage converter is used for sub-threshold and near-threshold circuits, then device complexity is reduced, but performance consistency and power efficiency deteriorate due to exponential sensitivity to temperature and process variations
Solution Approach 1:
The voltage converter is segmented into two distinct converters: a first voltage converter optimized for sub-threshold circuits and a second voltage converter optimized for near-threshold circuits. Each converter is specifically designed to handle its respective threshold range, eliminating the performance degradation that occurs when a single converter must serve both ranges. This segmentation allows each converter to be tuned for optimal performance in its specific operating range, thereby maintaining performance consistency across varying temperature and process conditions.
2Adaptability or versatility
If a single voltage converter is used to cover both sub-threshold and near-threshold ranges, then adaptability is improved, but power efficiency and performance deteriorate due to inability to optimize for specific energy modes
Solution Approach 1:
The system dynamically selects between the first and second voltage converters based on the operating conditions, specifically the threshold voltage range and energy mode requirements. The converter selection is not static but adapts in real-time to the circuit's needs, ensuring that the most energy-efficient converter is always used for the current operating range. This dynamic adaptation maintains high power efficiency while preserving the ability to cover both sub-threshold and near-threshold voltage ranges.
3Productivity
If voltage converter operates in active mode with high performance, then productivity is improved, but energy consumption increases and is unsuitable for sleep mode
Solution Approach 1:
The voltage converter system is segmented into two specialized converters: one optimized for active mode operation with high switching speed and another optimized for sleep mode operation with ultra-low quiescent current. This segmentation allows the system to achieve high productivity when needed while consuming minimal energy during sleep mode, as each converter is independently optimized for its specific operational state rather than attempting to compromise between conflicting requirements.
4Use of energy by moving object
If voltage converter is optimized for ultra-low quiescent current in sleep mode, then energy efficiency is improved, but switching speed and performance deteriorate
Solution Approach 1:
The system dynamically switches between the first voltage converter (optimized for active mode with high switching speed) and the second voltage converter (optimized for sleep mode with ultra-low quiescent current) based on the operational state. This dynamic configuration ensures that when sleep mode is required, the low-power converter is activated to minimize energy consumption, while when active operation is needed, the high-performance converter is activated to restore switching speed, thus resolving the trade-off between energy efficiency and performance.
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.