On-Die Thermal Control for Low-Temperature VLSI Speed Stability
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Solution Overview
Problem
Modern sub-micron CMOS technologies face challenges in maintaining circuit performance and reliability at low temperatures, particularly below 0° C., due to the phenomenon of Temperature Inversion, which slows down integrated circuits and limits their adoption in low-temperature applications.
Innovation Solution
A thermal management system integrated into VLSI ICs or SoCs, comprising a temperature sensor, thermal heater, and thermal control logic, which monitors temperature and controls the thermal heater to maintain a stable temperature above a certain threshold, preventing the circuit from dropping below a certain low temperature, thereby suspending or resuming processor functions as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If integrated circuits operate at lower temperatures, then reliability improves, but circuit speed decreases due to Temperature Inversion
Solution Approach 1:
The patent changes the temperature parameter dynamically by introducing a heater module that can raise the local temperature when the circuit operates in the problematic low-temperature range. The temperature sensor continuously monitors the die temperature and feeds back to the heater control logic, which adjusts the heater power to maintain temperature within the optimal operating range, thereby resolving the speed degradation caused by Temperature Inversion while preserving reliability benefits of cooler operation.
2Adaptability or versatility
If lower temperature bound is targeted, then application range expands, but design complexity and cost increase
Solution Approach 1:
The patent implements a self-regulating thermal management system where the integrated circuit monitors its own temperature through the temperature sensor and automatically adjusts its operating conditions via the heater module and control logic. This self-service approach eliminates the need for external thermal management infrastructure, reducing overall system complexity while enabling operation across expanded temperature ranges including extreme low-temperature applications.
3Adaptability or versatility
If lower temperature bound is targeted, then application range expands, but development cycle increases
Solution Approach 1:
The patent incorporates temperature management functionality directly into the circuit design phase, with the heater module, temperature sensor, and control logic being co-designed and integrated together. This preliminary action approach allows thermal characteristics to be optimized during the main design cycle rather than requiring separate extensive testing and iteration at lower temperatures, thereby reducing development time while achieving expanded application range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution stabilizes the temperature of SoCs, reduces design costs, allows for smaller die sizes, shortens development cycles, and enables the use of integrated circuits in extremely low-temperature applications, such as automobile systems.
Implementation Method 1
turn on a thermal heater
Data Source
AI summary
Apparatus and methods are provided for managing operations of a semiconductor chip. In an exemplary embodiment, there is provided a semiconductor chip that may comprise a temperature sensor, a thermal heater, a processor and thermal control logic. The thermal control logic may be configured to: determine that a first temperature read-out from the temperature sensor reaches a first temperature threshold value, turn on the thermal heater, determine that a second temperature read-out from the temperature sensor reaches a second temperature threshold value that is lower than the first temperature threshold value, suspend functions of the processor, determine that a third temperature read-out from the temperature sensor reaches the first temperature threshold value, resume the functions of the processor, determine that a fourth temperature read-out from the temperature sensor reaches a third temperature threshold value that is higher than the first temperature threshold value and turn off the thermal heater.