Stand-Alone Controller for Indexless Tandem Semiconductor Test
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Solution Overview
Problem
Automated semiconductor test equipment experiences significant idle time due to mechanical manipulations, limiting the efficiency and cost-effectiveness of testing processes, and existing solutions have not adequately addressed the need to reduce index time without increasing equipment costs or complexity.
Innovation Solution
A stand-alone controller for multiplexed handler test cells is introduced, which includes both handler drivers and data post-processors, allowing for efficient control and coordination of handler activities with the tester, reducing index time through parallel redundancy and multithreading, and enabling easier setup and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical operations speed is increased to reduce index time, then productivity is improved, but device complexity and cost increase due to higher speed equipment requirements and maintenance needs
Solution Approach 1:
The system segments the testing function across multiple handlers (first handler, second handler, third handler) that share a single tester. This segmentation allows parallel processing where multiple handlers can independently prepare and transfer devices, reducing the overall index time without requiring each individual handler to operate at higher speeds, thus avoiding the complexity and cost penalties of high-speed mechanical operations.
2Productivity
If mechanical operations speed is increased to reduce index time, then productivity is improved, but loss of time increases due to more frequent maintenance, calibration, and replacement
Solution Approach 1:
The multiplexed handler system maintains continuous useful action by implementing parallel redundancy where multiple handlers can operate simultaneously. When one handler completes its cycle or requires maintenance, another handler can immediately take over without interrupting the overall testing flow. This continuity eliminates idle time in the testing process while distributing maintenance requirements across multiple lower-speed handlers, reducing the frequency and impact of maintenance interruptions.
3Device complexity
If fewer testers are used to reduce capital investment, then cost is reduced, but productivity decreases due to limited testing capacity
Solution Approach 1:
The single tester is designed with universal, multiplexed interface capabilities that allow it to serve multiple handlers simultaneously. The tester can dynamically allocate its resources to different handlers based on demand, and the handlers can be configured to work in parallel on different device types or test sequences. This multi-functionality enables the system to achieve the throughput of multiple dedicated tester-handler pairs using only a single tester, dramatically reducing capital investment while maintaining or improving productivity.
Data Source
AI summary
A system and method utilize a stand-alone controller for a multiplexed handler test cell in automated and robotic semiconductor test equipment for indexless tandem semiconductor testing. The stand-alone controller is configured such that functions relating to both the handler drivers and the data post-processor of the multiplexed handler tested cell are included within the stand-alone controller. The system and method also include provisions for using a virtual multiplexed handler test cell in a preliminary stage prior to actual implementation of the actual multiplexed handler test cell. This configuration permits the stand-alone controller to control the functions of the multiplexed handlers and to coordinate their activity with the tester.