Wafer Testing System Integrating RFID and EDA for Real-Time Yield Monitoring
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Solution Overview
Problem
Existing wafer testing systems fail to integrate RFID techniques with engineering data analysis (EDA) systems, preventing real-time monitoring of wafer manufacturing processes and yields.
Innovation Solution
A wafer testing system is developed that integrates RFID techniques with an EDA system, comprising a wafer storage section, prober, RFID middleware unit, and manufacturing execution system (MES), allowing real-time monitoring of wafer test results and inventory tracking through an RFID reader, middleware processing, and data integration between EDA and MES systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RFID techniques are used for wafer tracking and transport, then wafer inventory management is improved, but real-time monitoring of wafer testing process and yield is not achieved
Solution Approach 1:
The patent combines RFID tracking system with EDA testing system by integrating an RFID reader into the prober and establishing data communication between the RFID middleware unit and EDA system. This merging allows simultaneous acquisition of wafer identification information and testing data, enabling real-time monitoring of both transport status and testing process through the MES system.
Solution Approach 2:
The patent introduces an RFID middleware unit as an intermediary component that bridges the RFID reader and the EDA system. The middleware unit receives RFID tag information, processes it into wafer information, and transmits it to the MES system, which then integrates it with yield information from the EDA system. This intermediary structure enables seamless data flow and real-time monitoring without disrupting existing systems.
2Productivity
If RFID reader is integrated into prober, then wafer information acquisition is improved, but system complexity increases
Solution Approach 1:
The prober is designed with multi-functionality by integrating both the original probing function and the RFID reading function into a single device. The RFID reader is incorporated into the prober structure, allowing simultaneous or sequential execution of wafer probing and RFID tag reading operations. This universal design improves productivity by acquiring both physical and identification information in one positioning event while managing system complexity through functional integration.
3Reliability
If data integration between EDA and MES systems is implemented, then real-time yield monitoring is achieved, but data processing complexity increases
Solution Approach 1:
The MES system serves as an intermediary data processing platform that receives and integrates information from both the RFID middleware unit (wafer identification data) and the EDA system (testing and yield data). The MES system correlates wafer identification information with testing results and yield information, enabling real-time monitoring without requiring direct complex integration between EDA and RFID systems. This intermediary approach manages data processing complexity while achieving reliable real-time yield monitoring.
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
Enables real-time monitoring of wafer-based manufacturing processes and yields, enhancing operational efficiency and transparency by sending test results directly to the EDA system for immediate analysis and decision-making.
Implementation Method 1
a prober, provided with an RFID reader for reading a tag info stored in the RFID tag
Data Source
AI summary
This invention provides a wafer testing system and testing method thereof. The wafer testing system comprises a wafer storage section, a prober, a tester, an RFID middleware unit, an EDA system and an MES system. The wafer storage section stores a multiplicity of carriers, each of which is provided with at least a RFID tag. The prober comprises a RFID reader to read a tag information. The tester sends a test signal to the prober for implementing the wafer test so as to generate a test result and calls an interface program to convert the test result into a file conformed with a specific data format. The RFID middleware unit receives the tag information and calls related applications to process the tag information so as to generate a wafer information. The EDA system receives the file of the specific data format converted from the interface program and calculates thereof to generate a wafer yield information after wafer test. The MES system integrates the wafer information from the RFID middleware unit with the yield information from the EDA system so as to allow monitoring the wafer manufacturing process and testing yield rate in a real-time manner.