Digital Circuit Voltage Control Using Delay Monitor Feedback
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Solution Overview
Problem
In implantable medical devices like hearing systems, reducing power consumption is crucial, but lowering supply voltage increases digital circuit delay, making it challenging to meet timing requirements, which vary with IC processing, temperature, aging, and patient demands, necessitating an optimal voltage level that differs by chip and changes dynamically.
Innovation Solution
A method and arrangement that determine an acceptable delay value based on current operating demands and clock frequency, using a delay monitor circuit to measure and adjust the supply voltage, allowing for dynamic optimization of power consumption by adjusting the voltage level to maintain operational functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the supply voltage is reduced to lower power consumption, then power consumption decreases, but the delay of digital cells increases causing timing violations
Solution Approach 1:
The patent implements dynamic voltage adjustment by continuously monitoring circuit delay and adapting the supply voltage in real-time. The system transitions from a static voltage approach to a dynamic one where the voltage is adjusted based on actual circuit performance, allowing the circuit to operate at the lowest possible voltage that still meets timing requirements under varying conditions such as temperature, aging, and process variations.
Solution Approach 2:
The patent employs a feedback mechanism where the measured delay of the digital circuit is compared against acceptable delay values, and the supply voltage is adjusted accordingly. This closed-loop control system uses the delay measurement as feedback to automatically tune the voltage, ensuring timing requirements are met while minimizing power consumption. The feedback loop continuously adapts to changing circuit characteristics without manual intervention.
2Duration of action of moving object
If the supply voltage is lowered to extend battery life, then operating lifetime increases, but the circuit may no longer meet timing requirements
Solution Approach 1:
The system dynamically adjusts the supply voltage based on real-time delay measurements, allowing the circuit to operate at minimum viable voltage levels that still ensure timing compliance. This dynamic adaptation enables extended battery life while maintaining reliability, as the voltage is continuously optimized rather than fixed at conservative levels.
Solution Approach 2:
The patent implements a self-adjusting voltage control system that automatically monitors and tunes the supply voltage without external intervention. The system serves itself by using its own delay performance as the basis for voltage adjustment, eliminating the need for manual calibration or conservative voltage settings. This self-service approach maximizes battery life while ensuring timing requirements are consistently met.
3Device complexity
If a fixed supply voltage is used to simplify design, then device complexity decreases, but power consumption cannot be optimized under varying operating conditions
Solution Approach 1:
The patent implements a self-adjusting voltage control system that automatically monitors circuit delay and tunes the supply voltage without external intervention. The system uses its own performance metrics to self-regulate, eliminating the need for complex external control circuits or manual calibration. This self-service approach adds minimal complexity while enabling dynamic power optimization under varying operating conditions such as temperature, aging, and process variations.
Solution Approach 2:
The system employs a feedback mechanism where delay measurements are continuously compared against acceptable thresholds, and voltage adjustments are made automatically based on this feedback. This closed-loop control adds minimal complexity compared to the benefits gained, as it uses simple comparison logic and voltage adjustment rather than complex control algorithms. The feedback approach enables power consumption optimization while maintaining manageable device complexity.
Data Source
AI summary
A method is provided for optimizing power consumption of a digital circuit which provides operational functionality based upon operating demands. The digital circuit is subject to a supply voltage level and a clock frequency. The method includes determining an acceptable delay value, from a plurality of predetermined acceptable delay values, for the digital circuit based upon current operating demands and the clock frequency. The supply voltage level and the clock frequency are applied to a delay monitor circuit. The delay experienced by the delay monitoring circuit is measured. The measured delay is compared with the determined acceptable delay value. Based on the outcome of the comparing step, the supply voltage level applied to the digital circuit is selectively adjusted. An arrangement for implementing the method is also provided.