Probe Card Assembly Shielding for High-Frequency Signal Integrity
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Solution Overview
Problem
Traditional cantilever probe cards experience noise interference from electromagnetic interactions during high-frequency tests, affecting test consistency and productivity.
Innovation Solution
The probe card assembly features test probes with a core wrapped in an insulation layer, and middle sections coated with conductive adhesive extending to a grounding end, reducing inductance and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional cantilever probe card with closely arranged test probes is used, then the device structure is simple and easy to manufacture, but electromagnetic interference between probes causes noise and reduces test accuracy
Solution Approach 1:
The patent introduces an intermediary shielding structure between closely arranged test probes. This shielding structure acts as a mediator that blocks electromagnetic interference between adjacent probes while maintaining their close arrangement for high-density testing, thus improving test accuracy without significantly increasing overall device complexity
Solution Approach 2:
The patent applies local quality by providing selective shielding only in regions where electromagnetic interference occurs between closely arranged probes. The shielding structure is localized between specific probe pairs rather than covering the entire probe card, maintaining simplicity in non-critical areas while improving measurement precision in interference-prone zones
2Productivity
If test probes are closely arranged for high-density testing, then productivity is improved, but electromagnetic interference increases causing noise and requiring repeated tests
Solution Approach 1:
The shielding structure serves as an intermediary element that allows probes to remain closely arranged for high-density testing while blocking electromagnetic interference. This enables maintaining high productivity through close probe arrangement while the shielding mediator prevents harmful electromagnetic interactions that would otherwise require repeated tests
3Reliability
If traditional probe card structure is used for high-frequency tests, then device complexity is low, but inductance between power and grounding probes affects signal transmission quality
Solution Approach 1:
The patent implements equipotentiality by providing multiple grounding probes connected to a common grounding terminal and using shielding structures tied to the grounding potential. This creates equipotential regions that reduce voltage differences and inductance between power and grounding probes, improving signal transmission quality for high-frequency tests
Solution Approach 2:
The patent applies segmentation by dividing the grounding system into multiple grounding probes distributed across the probe card, each connected to a common grounding terminal. This segmented grounding approach reduces inductance by providing multiple low-inductance paths to ground, improving reliability for high-frequency signal transmission
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
This design enhances accuracy and reduces noise during high-frequency tests, allowing smooth transmission of high-frequency signals and improving testing efficiency.
Implementation Method 1
noises brought by electromagnetic interference between the probes can significantly affect the consistency of test results
Implementation Method 2
the middle section coated with a conductive adhesive that extends to a grounding end of the main body of the probe card assembly
Data Source
AI summary
Disclosed is a probe card assembly including a main body, a probe base provided at a center of the main body, and a plurality of test probes connecting the main body and the probe base. Therein, each of the test probes has a tip extending out from the probe base for contacting and testing a wafer. The test probes include at least one power probe, at least one grounding probe and a plurality of signal probes, wherein each of the test probes has a middle section between the main body and the probe base. Each of the power probe and the signal probes further contains therein a core that is wrapped by an insulation layer.