Semiconductor Temperature Compensation Using Bandgap Check Voltage
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Solution Overview
Problem
Conventional semiconductor devices face failures and malfunctions due to temperature variations within the device, particularly from abnormal heat generation, without effective means to utilize internal temperature information for compensation.
Innovation Solution
A semiconductor device incorporating a check voltage generation circuit and control circuit to detect and compensate for temperature variations by comparing a check voltage with a compensation voltage, using a bandgap type current generation circuit to generate a reference current independent of temperature, and a control circuit to adjust the check voltage based on process variations, thereby enhancing temperature detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor devices operate without temperature compensation, then device complexity is low, but reliability deteriorates due to temperature variations causing failures and malfunctions
Solution Approach 1:
The semiconductor device uses its own internal bandgap reference circuit to generate temperature compensation signals without requiring external temperature sensors or additional components. The bandgap reference voltage inherently reflects temperature variations, allowing the device to self-monitor and self-compensate for temperature effects, thereby improving reliability while avoiding increased device complexity
Solution Approach 2:
The device implements a feedback mechanism where the bandgap reference voltage (which varies with temperature) is fed into the control circuit to dynamically adjust operating parameters. This feedback loop enables real-time temperature compensation, ensuring stable operation across temperature ranges while maintaining a simple device architecture
2Reliability
If additional temperature detection components are added to compensate for temperature variations, then reliability improves, but device complexity and cost increase
Solution Approach 1:
The bandgap reference circuit serves dual purposes: it provides a stable voltage reference for normal device operation and simultaneously functions as a temperature detection mechanism. By extracting temperature information from the inherent temperature dependence of the bandgap voltage, the device eliminates the need for separate temperature sensors, maintaining simplicity while achieving accurate temperature detection and compensation
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 solution allows for precise temperature detection within the semiconductor device, reducing the risk of failures and malfunctions by compensating for temperature variations, without the need for additional temperature detection components, thus maintaining device reliability and reducing system costs.
Implementation Method 1
using a bandgap type current generation circuit to generate a reference current independent of temperature
Implementation Method 2
The semiconductor element is configured to output a compensation voltage corresponding to temperature
Data Source
AI summary
A semiconductor device includes: a semiconductor element configured to output a compensation voltage; a constant current circuit configured to output a constant current so as to compensate for temperature dependence according to the comparison of the compensation voltage and a reference voltage; an oscillation circuit configured to output an oscillation signal according to the constant current; a check voltage generation circuit configured to output a check voltage; and a signal generation circuit configured to output a temperature information signal corresponding to the compensation voltage and the check voltage.