Adaptive Voltage Regulation for Sub-Threshold Energy Modes
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Solution Overview
Problem
Existing circuits operating in the sub-threshold and near-threshold domains face exponential sensitivities 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 system comprising multiple converters/regulators, a multiplexing circuit, and a control facility that dynamically adjusts voltage levels based on process corner, temperature, and input voltage, switching between high-efficiency and low-quiescent current modes to maintain consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If circuits operate in sub-threshold and near-threshold domains to reduce power consumption, then energy efficiency is improved, but switching speed and power become exponentially sensitive to manufacturing process variations and temperature
Solution Approach 1:
The voltage converter dynamically adjusts the output voltage level based on real-time detection of process corner and temperature conditions. The system transitions from static voltage regulation to adaptive voltage control, where the converter continuously monitors environmental parameters and modifies its output accordingly to maintain consistent circuit performance across varying conditions.
Solution Approach 2:
The system changes the voltage parameter adaptively based on detected process and temperature conditions. By detecting whether transistors are operating in slow, typical, or fast process corners and at what temperature, the converter adjusts the supply voltage to compensate for exponential sensitivities, thereby stabilizing switching speed while maintaining low power consumption in sub-threshold operation.
2Device complexity
If a single voltage converter is used to simplify the system, then device complexity is reduced, but it cannot simultaneously meet the bandwidth requirements of active mode and ultra-low quiescent current requirements of sleep mode
Solution Approach 1:
The voltage converter is designed to perform multiple functions by adapting its operation to different energy modes. A single converter architecture handles both active mode (providing sufficient bandwidth) and sleep mode (achieving ultra-low quiescent current) requirements through adaptive voltage adjustment based on detected operating conditions, eliminating the need for separate converters for different modes.
3Device complexity
If voltage levels are fixed to simplify control, then control facility complexity is reduced, but circuit performance cannot be maintained under changing process and temperature conditions
Solution Approach 1:
The control facility incorporates feedback mechanisms that detect process corner (slow, typical, fast) and temperature conditions, then use this information to adjust the output voltage accordingly. This closed-loop approach allows the system to maintain consistent performance across varying conditions while keeping the control logic relatively simple through standardized detection and adjustment protocols.
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.