Verification Probe System for Automated Test Socket Calibration
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Solution Overview
Problem
Automated test equipment systems face challenges in accurately calibrating and verifying the performance at the contactor pins of the DUT test socket due to the fragility of traditional RF probes and the lack of a direct method to measure compression, leading to measurement errors and variability in signal characteristics.
Innovation Solution
A verification probe system with a moveable platform and integrated circuit test probe assembly, featuring co-planar waveguide lead frames and RF connector assemblies, allows for precise alignment and compression of conductive pins, enabling accurate impedance matching and measurement at the test socket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RF probes are used for calibration, then the calibration process can be performed, but the probes are too fragile to be utilized when compression of contactor pins is required
Solution Approach 1:
The verification probe assembly is segmented into distinct functional components: a robust housing structure, a co-planar waveguide lead frame with contactor pins, and an RF connector assembly. This segmentation allows each component to be optimized independently - the housing provides mechanical robustness while the lead frame provides electrical precision, resolving the contradiction between probe durability and measurement accuracy.
Solution Approach 2:
The co-planar waveguide lead frame acts as an intermediary between the robust RF connector assembly and the contactor pins requiring compression. This intermediate structure transfers mechanical force from the connector through the lead frame to the pins, enabling controlled compression while maintaining signal integrity and measurement precision that would be lost with direct probe contact.
2Manufacturing precision
If compression of contactor pins is required for testing, then proper electrical contact is achieved, but traditional RF probes lack the robustness to withstand the compression forces
Solution Approach 1:
The verification probe assembly incorporates dynamic compression capability through the movable platform and spring-loaded contactor pins. The system can apply controlled compressive forces to achieve proper electrical contact, then maintain that compressed state during measurement. This dynamic approach allows the probe to withstand compression forces that would damage traditional rigid probes while maintaining precise alignment.
Solution Approach 2:
The lead frame is constructed as a composite structure combining conductive metal traces on a rigid substrate, with spring-loaded contactor pins providing both mechanical strength for compression and electrical conductivity for signal transmission. This composite construction enables the probe to simultaneously withstand compression forces and maintain precise electrical contact for accurate measurements.
3Measurement precision
If a direct method of measuring performance at the DUT test socket is implemented, then calibration accuracy improves, but the system complexity increases
Solution Approach 1:
The verification probe assembly is designed as a universal calibration tool that can measure performance at the DUT test socket directly. The co-planar waveguide lead frame configuration allows the same probe structure to handle multiple signal types and frequencies, while the movable platform can position the probe at various test points. This multi-functionality reduces the need for multiple specialized probes, managing system complexity while maintaining high measurement precision.
4Stability of the object's composition
If the gap and signal width are defined to match impedance, then signal characteristics remain consistent, but the manufacturing precision requirements increase
Solution Approach 1:
The co-planar waveguide lead frame is designed with specific geometric parameters (gap width, signal trace width, ground plane dimensions) that are optimized for impedance matching. By carefully controlling these dimensional parameters during manufacturing, the system achieves consistent 50-ohm impedance across all signal paths. The spring-loaded contactor pins further stabilize electrical characteristics by maintaining constant contact pressure, compensating for minor manufacturing variations and ensuring signal consistency.
Data Source
AI summary
A verification probe system is configured to verify an automated test platform and includes: an integrated circuit test probe assembly; and a moveable platform configured to position the integrated circuit test probe assembly proximate one of more conductive pins included within a test socket assembly of the automated test platform.