SPECT Detector Interposer for Post-Attachment ASIC Testing
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Solution Overview
Problem
Current semiconductor detectors for SPECT systems are not adequately tested post-attachment, leading to potential issues with detector performance and the need for entire assemblies to be discarded if problems arise, as existing testing methods do not confirm correct operation after integration with ASICs.
Innovation Solution
The use of an interposer, such as an elastomeric device with conductors, is introduced to provide temporary and separate electrical connections between semiconductor detectors and signal processing circuitry, allowing for testing before and after integration, and enabling direct contact without bonding for final use in SPECT systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct-attachment technology is used to fully integrate the detector and ASIC into a compact unit, then device compactness and integration are improved, but the ability to test the detector post-attachment is lost
Solution Approach 1:
The patent introduces an interposer as an intermediary component between the detector and ASIC. This interposer contains through-conductors that enable electrical connection while maintaining the ability to perform post-attachment tests. The interposer acts as a mediator that allows testing access without requiring the detector to be directly bonded to the ASIC, thus resolving the contradiction between integration and testability.
2Productivity
If the detector and ASIC are assembled into a fully integrated unit without intermediate testing, then manufacturing efficiency is improved, but the risk of defective assemblies increases
Solution Approach 1:
The patent enables preliminary testing of the detector after attachment to the carrier but before final ASIC integration. The interposer structure allows test probes to access detector electrodes through the carrier, enabling quality verification at an intermediate stage. This preliminary action reduces the risk of defective final assemblies while maintaining manufacturing efficiency.
3Measurement precision
If connectors are used in test fixtures to qualify detectors, then testing capability is improved, but the cost of replacing defective detectors increases
Solution Approach 1:
The interposer serves as a reusable intermediary component that enables accurate detector qualification through its through-conductors. By using the interposer as a mediating test fixture, detectors can be thoroughly tested before final assembly, reducing the likelihood of defective detectors reaching production. The interposer itself can be reused across multiple detectors, reducing overall testing costs.
Data Source
AI summary
For testing or production of a semiconductor-based detector in SPECT, an interposer, such as elastomeric device with conductors, is sandwiched between a carrier and the semiconductor detector. The conductors allow for temporary separate connections of detector electrodes to signal processing circuitry, providing for testing of the detector operating with the signal processing circuitry. The interposer provides separate electrical connections for testing but may also be used in a final, fully integrated detector for use in a SPECT system.