Investigation of split groundplanes at the connector for EMI control

EMI can often be reduced by selectively filtering various parts of a given system. One common method employed by designers is to split the groundplane near the chassis and route I/O lines over the split. The rationale is based on providing a large series impedance to common-mode on the I/O lines. In...

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Bibliographic Details
Main Authors: Hockanson, D., Drewniak, J.L., Nuebel, J., Parker, J.C.
Format: Conference Proceeding
Language:English
Subjects:
Circuit noise
Connectors
Electromagnetic compatibility
Electromagnetic interference
Frequency
Impedance
Magnetic fields
Magnetic noise
Noise level
Solid modeling
Online Access:Request full text
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Summary:EMI can often be reduced by selectively filtering various parts of a given system. One common method employed by designers is to split the groundplane near the chassis and route I/O lines over the split. The rationale is based on providing a large series impedance to common-mode on the I/O lines. In this manner, PCB designers hope to lower the level of noise currents contributing to radiation. This work studies the efficacy of the groundplane split as a deterrent for EMI associated with I/O lines being driven against other extended reference structures. A test-board was developed to analyze the impedance of the groundplane with various configurations.
DOI:10.1109/ISEMC.1997.667564