RF Probe Card Electromagnetic Shielding for IC Crosstalk Reduction
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Solution Overview
Problem
Current probe cards for testing Integrated Circuits (ICs) using Radio Frequency (RF) signals face challenges with crosstalk phenomena due to electromagnetic interference, which can hinder parallel testing of multiple ICs, increasing testing costs and reducing efficiency.
Innovation Solution
The implementation of a probe card with electromagnetic shield structures, including shielding probes biased to a constant potential, arranged around the scribe lines on the semiconductor wafer to reduce electromagnetic field irradiation and minimize crosstalk between probes, allowing for parallel testing of multiple ICs without compromising test accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ICs are tested in parallel using a probe card, then testing efficiency is improved, but crosstalk between probes increases due to electromagnetic interference
Solution Approach 1:
The patent introduces electromagnetic shields as intermediary elements positioned between adjacent probes on the probe card. These shields act as mediators that block electromagnetic fields generated by one probe from interfering with adjacent probes, thereby eliminating crosstalk while preserving the ability to test multiple ICs in parallel
Solution Approach 2:
The patent extracts the harmful electromagnetic field generation by removing ground connections from probe tips during RF testing. By disconnecting the ground path at the probe tip while maintaining reference potential through other means, the patent eliminates the source of electromagnetic interference that causes crosstalk between adjacent probes
2Measurement precision
If electromagnetic shields are added to the probe card to reduce crosstalk, then test accuracy is improved, but device complexity increases
Solution Approach 1:
The patent changes the electrical parameter configuration by biasing electromagnetic shields to constant potential (such as ground potential) rather than leaving them floating. This parameter change optimizes the shields' effectiveness in blocking electromagnetic fields while maintaining a relatively simple structural implementation
Solution Approach 2:
The patent applies electromagnetic shields selectively at specific locations where crosstalk is most problematic, rather than uniformly across the entire probe card. This localized approach provides targeted interference reduction while minimizing the overall complexity increase
3Object-generated harmful factors
If probes are disconnected from ground during RF testing, then electromagnetic interference is reduced, but signal reference stability may be compromised
Solution Approach 1:
The patent uses electromagnetic shields biased to constant potential as intermediary reference elements. These shields provide a stable reference potential for RF signals while being positioned to block electromagnetic interference, effectively mediating between the need for ground disconnection and the need for signal stability
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 solution effectively reduces crosstalk occurrences, enabling simultaneous testing of multiple ICs while maintaining test integrity, thereby improving testing efficiency and reducing costs associated with sequential IC testing.
Implementation Method 1
at least one electromagnetic shield structure corresponding to the at least one probe adapted to provide and/or receive the radio frequency test signal for the at least partial shielding of an electromagnetic field irradiated by such at least one probe
Data Source
AI summary
A probe card includes a number probes. Each probe is adapted to contact a corresponding terminal of a circuit integrated in at least one die of a semiconductor material wafer during a test phase of the wafer. The probes include at least one probe adapted to provide and/or receive a radio frequency test signal to/from the corresponding terminal during the test phase. The probe card further includes at least one electromagnetic shield structure corresponding to the at least one probe adapted to provide and/or receive the radio frequency test signal for the at least partial shielding of an electromagnetic field irradiated by such at least one probe adapted to provide and/or receive the radio frequency test signal.