Temperature-Adaptive Power Supply Circuit for Semiconductor Logic
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Solution Overview
Problem
The reduction in the number of terminals and package downsizing in semiconductor devices for small-scale equipment, such as smartphones and tablets, leads to decreased heat dissipation characteristics, making it difficult to ensure a sufficient temperature margin in thermal design due to increased power consumption and self-heating.
Innovation Solution
A power supply circuit with a reference voltage generation circuit and a power supply voltage maintenance circuit that generates a reference voltage with a negative temperature coefficient and suppresses its decrease, maintaining the power supply voltage above a lower limit to prevent overheating and ensure stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If package downsizing and reduction in the number of terminals are implemented, then device size is reduced, but heat dissipation characteristics deteriorate
Solution Approach 1:
The patent changes the temperature characteristics parameter of the power supply voltage by generating a reference voltage with a negative temperature coefficient. This causes the power supply voltage to automatically decrease as temperature increases, thereby reducing power consumption and self-heating in the logic circuit, which resolves the heat dissipation problem in downsized packages
2Reliability
If power supply voltage is maintained at a constant level, then operation performance is ensured, but power consumption increases due to temperature rise
Solution Approach 1:
The patent makes the power supply voltage dynamic by introducing temperature-dependent adjustment. The reference voltage generation circuit produces a voltage that automatically adapts to temperature changes, causing the power supply voltage to decrease when temperature rises, thus reducing power consumption while maintaining sufficient operation performance
Solution Approach 2:
The patent implements a feedback mechanism where the temperature characteristics of the reference voltage are used to automatically adjust the power supply voltage. The negative temperature coefficient creates a feedback loop that reduces power supply voltage in response to temperature increase, thereby controlling power consumption
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
The power supply circuit effectively suppresses power consumption increases due to temperature rise, ensuring stable operation and facilitating thermal design by maintaining a sufficient temperature margin, even in small-scale packages.
Implementation Method 1
a reference voltage generation circuit generating a reference voltage based on a first voltage decreased by temperature increase
Data Source
AI summary
A semiconductor device configured to suppress increase in power consumption increased by temperature increase is provided. A logic circuit has characteristics in which a lower limit voltage achieving operations is decreased by temperature increase. A reference voltage generation circuit generates a reference voltage based on a negative coefficient voltage Vpn2 decreased by temperature increase. A voltage regulator circuit generates a power supply voltage based on the reference voltage. A power supply voltage maintenance circuit suppresses decrease in the reference voltage decreased by temperature increase, before the power supply voltage is made lower than a lower limit voltage by temperature increase.