Device-Specific Operating Voltage Configuration for IC Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Variations in the manufacturing process of integrated circuits lead to non-uniform feature sizes, resulting in inconsistent static power and circuit delay across devices, necessitating excessive headroom in voltage and delay specifications to ensure performance, which degrades guaranteed power and performance specifications.
Innovation Solution
A method and circuit design that determines a minimum operating voltage (Vmin) for each device and stores it in non-volatile memory, allowing the power controller to set the operating voltage, along with a voltage scaling factor, to optimize power and delay specifications by adjusting the voltage based on device-specific requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If headroom is added to voltage and delay specifications to account for device variations, then reliability of guaranteed specifications is improved, but manufacturing precision and performance specifications deteriorate
Solution Approach 1:
The patent segments the specification approach by device type. Devices are divided into slow, medium, and fast categories based on their actual performance characteristics. Each segment receives tailored voltage and delay specifications rather than a single conservative specification for all devices. This allows fast devices to operate closer to their true capabilities while slow devices receive appropriate headroom, resolving the contradiction between reliability and specification precision.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on device performance category. Instead of using a fixed conservative voltage specification for all devices, the system adjusts voltage levels according to whether devices are slow, medium, or fast. This parameter change allows specifications to match actual device capabilities, improving both reliability of guarantees and precision of specifications simultaneously.
2Reliability
If conservative voltage specifications are used to cover all devices, then reliability is improved, but power efficiency deteriorates
Solution Approach 1:
The patent segments devices into performance categories (slow, medium, fast) and applies different voltage specifications to each segment. Fast devices that can operate efficiently at higher voltages are not forced to use conservative low-voltage specifications, thereby reducing their power consumption while maintaining reliability for devices that actually need the headroom.
Solution Approach 2:
The patent changes the operating voltage parameter based on device performance characteristics. By allowing fast devices to operate at higher voltages closer to their optimal efficiency point rather than forcing conservative voltage levels, the system reduces overall power consumption while maintaining specification reliability through category-specific guarantees.
3Manufacturing precision
If device-specific voltage measurement and configuration is implemented, then power and delay specifications are improved, but device complexity increases
Solution Approach 1:
The patent performs voltage measurement and device categorization during the manufacturing test phase before devices are deployed. Device characteristics are determined and configured in advance, so that when devices are deployed, the appropriate voltage specifications are already established. This preliminary action eliminates the need for complex real-time measurement and adjustment systems, reducing overall device complexity while maintaining specification precision.
Data Source
AI summary
A method and circuit for device specific configuration of an operating voltage is provided. A circuit design is analyzed to determine a maximum gate-level delay for the circuit design. A minimum voltage value corresponding to the maximum gate-level delay is determined along with a default voltage value corresponding to a default gate-level delay. A voltage scaling factor corresponding to the minimum voltage and default voltage values is determined. The circuit design is synthesized such that the synthesized design includes the voltage scaling value. The synthesized design specifies setting an operating voltage to a value of a startup voltage value scaled by the voltage scaling value.