Dynamic Supply Voltage Adjustment for Low-Temperature Chip Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Advanced semiconductor process technologies below 40 nm exhibit a temperature-inversion phenomenon where device performance worsens at cold temperatures, necessitating a solution to maintain performance consistency across temperature variations.
Innovation Solution
A method and apparatus that monitor the temperature of a semiconductor chip and adjust the supply voltage based on the temperature, increasing it linearly with decreasing temperature below a threshold to compensate for performance degradation at low temperatures, using on-chip or off-chip temperature sensors and controllers to interact with a voltage regulator module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supply voltage is increased to improve transistor performance at low temperatures, then device performance is improved, but power dissipation increases
Solution Approach 1:
The supply voltage is dynamically adjusted based on real-time temperature monitoring. The system transitions from a static voltage approach to a dynamic one where voltage increases as temperature decreases, optimizing performance while managing power consumption through continuous adaptation to thermal conditions
Solution Approach 2:
The system changes the supply voltage parameter in response to temperature variations. Specifically, the voltage is increased when temperature drops below a threshold, and decreased when temperature rises above the threshold, creating a temperature-dependent voltage regulation strategy that addresses the performance-power tradeoff
2Reliability
If supply voltage is increased to compensate for temperature inversion, then transistor performance is improved, but leakage power increases exponentially
Solution Approach 1:
The system implements a feedback mechanism where temperature is continuously monitored and used to adjust supply voltage. This closed-loop control ensures that voltage increases only when necessary (at low temperatures) and is reduced when temperatures rise, preventing excessive leakage power while maintaining performance when needed
Solution Approach 2:
The system takes preliminary action by preemptively adjusting voltage based on temperature trends. The controller proactively increases voltage before performance degradation becomes severe and reduces voltage before leakage power becomes excessive, preventing extreme conditions rather than reacting to them
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 approach maintains consistent chip performance across temperatures by dynamically adjusting supply voltage, allowing for increased performance at low temperatures without exceeding the total power envelope, primarily by reducing leakage power, and avoids the need for extensive low-temperature testing.
Implementation Method 1
The temperature may be monitored by a temperature sensor located on-chip or off-chip
Implementation Method 2
The controller may be configured to send a control signal to a voltage regulator module (VRM) to cause the VRM to adjust the supply voltage
Data Source
AI summary
In an embodiment, a method includes monitoring a temperature of a semiconductor chip and adjusting a supply voltage to the semiconductor chip based on the monitored temperature. The temperature may be monitored by a temperature sensor located on-chip or off-chip. Adjusting the supply voltage includes increasing the supply voltage as a function of the monitored temperature decreasing. The increase to the supply voltage occurs only if the monitored temperature is below a threshold temperature. The supply voltage adjustment is determined by a linear relationship having a negative slope with temperature.