IC Temperature Sensor Guard Band Power Management
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Solution Overview
Problem
Integrated circuits face challenges in managing power consumption and thermal output efficiently, as existing methods rely on static temperature measurements that do not account for variations across the die, leading to potential overheating and unnecessary power consumption.
Innovation Solution
The implementation of dynamic guard bands based on temperature deltas, allowing for strategic placement of temperature sensors to differentiate between ambient and load-induced heat, enabling adaptive voltage and frequency adjustments to optimize power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static temperature measurements are used, then device complexity is reduced, but temperature management reliability deteriorates due to inability to account for temperature variations across the die
Solution Approach 1:
The patent divides the integrated circuit die into multiple temperature zones by placing several temperature sensors at different locations. Each sensor independently measures temperature in its local zone, allowing the system to capture temperature variations across the die rather than relying on a single static measurement point.
Solution Approach 2:
The system dynamically adjusts operating parameters (voltage, frequency) based on real-time temperature measurements from multiple sensors. The processor continuously monitors temperature data and adapts its operation accordingly, transitioning from static to dynamic temperature management to maintain reliability under varying thermal conditions.
2Productivity
If higher operating voltage and frequency are selected, then productivity is improved, but temperature increases leading to potential overheating
Solution Approach 1:
The system implements a feedback mechanism where temperature sensors continuously monitor die temperature, and the processor uses this information to adjust operating voltage and frequency. When temperatures approach thermal limits, the system automatically reduces performance parameters to prevent overheating, creating a closed-loop control system that balances productivity with thermal management.
3Reliability
If guard bands are applied to temperature measurements, then temperature management reliability is improved, but power consumption increases due to more conservative voltage selection
Solution Approach 1:
The system dynamically adjusts guard band sizes based on actual temperature conditions and temperature deltas between different sensor locations. Rather than applying fixed, conservative guard bands universally, the system adapts the protection margin to current thermal states, reducing unnecessary power consumption while maintaining reliability when conditions permit.
Solution Approach 2:
The patent changes the parameter of guard band size dynamically based on measured temperature variations. When temperature deltas between sensors are small, smaller guard bands are applied, allowing higher voltage operation. When temperature variations are large, larger guard bands ensure safety. This parameter adaptation resolves the contradiction between reliability and power consumption.
4Measurement precision
If multiple temperature sensors are placed throughout the die, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The die is segmented into multiple monitoring zones, each equipped with a temperature sensor. This segmentation enables precise local temperature measurement without requiring a single complex sensing system, distributing the measurement function across multiple simple sensor units throughout the die.
Data Source
AI summary
Techniques are disclosed relating to power management of an integrated circuit. In one embodiment, an integrated circuit includes a plurality of temperature sensors configured to measure a plurality of temperatures at different locations in the integrated circuit. The integrated circuit further includes a power management circuit configured to determine a set of guard bands based on a temperature difference determined using the plurality of temperatures. The power management circuit is configured to adjust, using the set of guard bands, a particular one of the plurality of temperatures, and to use the adjusted particular temperature to manage power consumption of the integrated circuit. In some embodiments, the power management circuit is configured to manage the power consumption by adjusting a voltage supplied to the integrated circuit, the adjusted voltage being based on the adjusted particular temperature.