Transistor Active Region Degradation Evaluation Without RF Performance Loss
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Solution Overview
Problem
Conventional methods fail to accurately evaluate the degree of degradation in the active region of a transistor without degrading the RF performance of semiconductor devices, making it difficult to assess the performance and lifespan of semiconductor devices effectively.
Innovation Solution
A method and apparatus that calculates the resistance change rate of a resistor unit connected to the active region, measuring resistance before and after predetermined periods to evaluate degradation, while using an AC signal to heat the transistor and estimate temperature without affecting RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature-sensitive electrical parameters are used to measure the temperature of the active region, then the temperature can be measured, but the RF performance of the semiconductor device is degraded
Solution Approach 1:
The patent introduces a dummy transistor as an intermediary element that experiences the same temperature changes as the active region but does not affect the RF performance. The dummy transistor's electrical characteristics are used as a proxy to infer the active region's temperature, thus achieving temperature measurement without degrading RF performance.
Solution Approach 2:
The patent creates a copy of the active region in the form of a dummy transistor that replicates the thermal behavior without the functional requirements of the actual active region. This copy allows temperature measurement through electrical parameter changes while preserving the RF performance of the original active region.
2Measurement precision
If conventional temperature measurement techniques are used, then temperature can be measured, but the degree of degradation of the active region cannot be accurately evaluated
Solution Approach 1:
The patent employs feedback by continuously monitoring the electrical characteristics of the dummy transistor over time and comparing them to establish a baseline. This feedback mechanism allows for the detection of subtle changes in the active region's degradation state, enabling accurate evaluation of degradation程度 that conventional single-point measurements cannot achieve.
Solution Approach 2:
The patent performs preliminary measurements and establishes baseline characteristics of the dummy transistor before degradation occurs. By comparing subsequent measurements against this baseline, the system can accurately detect and evaluate the degree of degradation, providing information that conventional techniques miss.
3Measurement precision
If the active region temperature is measured directly, then temperature information is obtained, but the measurement affects the RF performance
Solution Approach 1:
The dummy transistor serves as a mediator that experiences the same thermal environment as the active region without being part of the RF signal path. This intermediary allows temperature information to be extracted through electrical measurements without the measurement process itself affecting RF performance.
Solution Approach 2:
The patent segments the semiconductor device into functional regions, separating the active region responsible for RF operations from the dummy transistor used for temperature measurement. This segmentation allows independent optimization where the dummy transistor can be measured without interfering with the active region's RF function.
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
Accurately evaluates the degree of degradation in the active region of a transistor, preventing semiconductor device failure by estimating temperature and resistance changes, thus maintaining RF performance and extending the device's lifespan.
Implementation Method 1
calculating the resistance change rate of the active region using the resistance of a resistor unit that receives heat of the active region
Implementation Method 2
using an AC signal to heat the transistor and estimate temperature
Data Source
AI summary
The present invention relates to a method and apparatus for evaluating the degree of degradation of an active region of a transistor. The method of evaluating the degree of degradation of the active region of the transistor includes measuring a first resistance of a resistor unit that receives heat generated in an active region of a transistor disposed on a semiconductor device, heating the semiconductor device, measuring a second resistance of the resistor unit, repeatedly performing the measuring of the first resistance, the heating of the semiconductor device and the measuring of the second resistance after a predetermined period of time, and evaluating the degree of degradation of the active region based on a plurality of measured first resistances and a plurality of measured second resistances.