RF Signal Connection Integrity Verification for Concurrent DUT Testing
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Solution Overview
Problem
Current wireless device test systems face challenges in confirming RF signal connection integrity, leading to potentially erroneous test results due to shorted, open, or mismatched impedance connections, which can increase manufacturing costs and downtime.
Innovation Solution
A system and method for confirming RF signal connections by monitoring signal levels and reflection signals, using replicas of a RF test signal, and comparing them against reference load impedances, while sweeping the test signal frequency to identify peak and valley signal level differences and phase changes indicative of connection quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If connection integrity confirmation is performed before testing, then test result accuracy is improved, but test time and production downtime increase
Solution Approach 1:
The system performs connection integrity confirmation as a preliminary action before actual device testing. By detecting connection status (shorted, open, or impedance mismatch) before committing to full test sequences, the system prevents wasted testing time on improperly connected devices while ensuring accurate results when connections are valid.
Solution Approach 2:
The patent introduces an intermediary connection detection mechanism that acts as a gatekeeper between device connection and full testing. This intermediary step uses reflection signal analysis to assess connection quality without performing complete device characterization, thus saving time while maintaining test accuracy.
2Productivity
If multiple DUTs are tested concurrently, then productivity is improved, but difficulty of detecting and measuring connection integrity increases
Solution Approach 1:
The system segments the testing process into independent parallel channels, each with its own signal source and reflection detector. This segmentation allows multiple DUTs to be tested concurrently while maintaining individual connection integrity monitoring for each channel, preventing cross-interference and simplifying detection.
Solution Approach 2:
The patent employs universal connection detection circuitry that can simultaneously monitor multiple DUTs using the same fundamental reflection analysis technique. The system uses identical signal generation and detection principles across all channels, making the multi-device process manageable despite increased complexity.
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 accurate confirmation of connection integrity and quality, reducing downtime by ensuring proper device connection before testing and anticipating maintenance needs, thus minimizing production costs and optimizing testing efficiency.
Implementation Method 1
monitoring signal levels and reflection signals, using replicas of a RF test signal
Data Source
AI summary
System and method for confirming radio frequency (RF) signal connections with multiple devices under test (DUTs) tested concurrently using replicas of a RF test signal. Cabled signal connections between the signal source and the DUTs are monitored by sensing levels of outgoing and related reflection RF signals. These signal levels are compared against similar signal levels when the outgoing RF signals are provided to reference impedances. Alternatively, the cabled signal connections have lengths of known signal wavelengths and the RF test signal frequency is swept such that minimum and maximum time delays between the outgoing and reflection RF signals go through minimum and maximum signal cycles with a difference of at least one full cycle. The reflection RF signal magnitude and phase are monitored, from which peak and valley signal level differences and phase changes are identified to determine return loss and phase changes indicative of DUT connection.