Imbalance Difference Model for Common-Mode Radiation From Printed Circuit Boards

The differential-mode signals in printed circuit board (PCB) traces are unlikely to produce significant amounts of radiated emissions directly; however these signals may induce common-mode currents on attached cables, enclosures, or heat sinks that result in radiated electromagnetic (EM) interferenc...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2011-02, Vol.53 (1), p.150-156
Main Authors: Changyi Su, Hubing, T H
Format: Article
Language:English
Subjects:
Applied sciences
Boards
Cables
Circuit boards
Common-mode radiation
Computational modeling
Conversion
Couplings
Design. Technologies. Operation analysis. Testing
Electric noise
Electrical engineering. Electrical power engineering
Electrical machines
electromagnetic (EM) coupling
Electromagnetic compatibility
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Equivalence
Exact sciences and technology
Geometry
imbalance difference model
Information, signal and communications theory
Integrated circuit modeling
Integrated circuits
Load modeling
Mathematical models
Mechanical cables
Numerical models
printed circuit board (PCB)
Printed circuit boards
Printed circuits
Regulation and control
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Telecommunications and information theory
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Description
Summary:The differential-mode signals in printed circuit board (PCB) traces are unlikely to produce significant amounts of radiated emissions directly; however these signals may induce common-mode currents on attached cables, enclosures, or heat sinks that result in radiated electromagnetic (EM) interference. Full-wave EM modeling can be performed in order to determine the level of radiated emissions produced by a PCB, but this modeling is computationally demanding and does not provide the physical insight necessary to explain how differential signals induce common-mode currents on distant objects. This paper describes a model for determining the common-mode currents on cables attached to a PCB that is based on the concept of imbalance difference . The imbalance difference model is derived from research that shows that changes in geometrical imbalance cause differential- to common-mode conversion. This paper applies an imbalance difference model to PCB structures and compares the resulting equivalent source configurations to those obtained with traditional voltage- and current-driven models, as well as full-structure simulations.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2010.2049853