Shielded Crosstalk Probe Layout for Accurate PCB Signal Measurement
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Solution Overview
Problem
Existing crosstalk measuring probes experience accuracy issues due to crosstalk occurring between the pins, which affects the measurement of crosstalk between signal patterns.
Innovation Solution
A crosstalk measuring method and probe design that includes a shield plate made of conductive material, positioned between the pins and in contact with the ground pattern, with a thickness greater than the skin depth of the electromagnetic waves, to shield electromagnetic interference and improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crosstalk measuring probe with pins is used to measure crosstalk between signal patterns, then the measurement function is achieved, but crosstalk occurs between the pins which reduces measurement accuracy
Solution Approach 1:
A shield plate is introduced as an intermediary component between the first pin and second pin. The shield plate includes a ground pattern that is electrically connected to a ground, and this ground pattern is positioned between the first pin and second pin to block electromagnetic coupling between them. This intermediary structure prevents the harmful crosstalk between pins while allowing the measurement function to proceed accurately.
2Volume of moving object
If pins are positioned close to each other for compact probe design, then device compactness is improved, but electromagnetic interference between pins increases
Solution Approach 1:
The shield plate with ground pattern serves as a mediator between closely positioned pins. Even when the first pin and second pin are positioned close together for compact probe design, the ground pattern on the shield plate is interposed between them to block electromagnetic fields, preventing interference while maintaining the compact form factor.
3Device complexity
If no shielding structure is added to the probe, then device complexity is reduced, but measurement accuracy deteriorates due to pin crosstalk
Solution Approach 1:
A shield plate is introduced as an intermediary component between the first pin and second pin. The shield plate includes a ground pattern that is electrically connected to a ground, and this ground pattern is positioned between the first pin and second pin to block electromagnetic coupling between them. This intermediary structure prevents the harmful crosstalk between pins while allowing the measurement function to proceed accurately.
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
The method and probe design effectively suppress crosstalk between pins, enhancing the accuracy of crosstalk measurements between signal patterns by shielding electromagnetic interference.
Implementation Method 1
The shield plate has a thickness greater than a skin depth for an electromagnetic wave equal in frequency to signals flowing through the first signal pattern and the second signal pattern
Implementation Method 2
The shield plate has a thickness greater than a skin depth for an electromagnetic wave equal in frequency to signals flowing through the first signal pattern and the second signal pattern
Data Source
AI summary
A crosstalk measuring method includes: preparing a printed wiring board having a first signal pattern and a second signal pattern arranged side by side at an interval in a first direction and extending in a second direction orthogonal to the first direction, and a ground pattern disposed between the first signal pattern and the second signal pattern in the first direction and extending in the second direction; preparing a probe having a first pin, a second pin, and a shield plate that is made of a conductive material; and measuring crosstalk between the first signal pattern and the second signal pattern. Each of the first pin and the second pin has a distal end and a proximal end opposite to the distal end.