Investigation of fundamental EMI source mechanisms driving common-mode radiation from printed circuit boards with attached cables

Hockanson, D.M.; Drewniak, James L.; Hubing, T.H.; Doren, T.P. Van; Sha, Fei; Wilhelm, Michael J.

doi:10.1109/15.544310

Cited by 244 publications

(84 citation statements)

References 8 publications

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“…Common-mode currents as low as 5 μA induced on a 1-m cable can result in radiated fields that exceed the FCC Class B limit. The physics of this coupling was first described and quantified in [9,10], and refinements to the original model I/O coupling EMI calculator have been developed over the years [14,16,17,19,21]. Electric-field (or voltage-driven) coupling is illustrated in Fig.…”

Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Hubing¹

2013

Journal of electromagnetic engineering and science

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Meeting electromagnetic compatibility (EMC) requirements can be a significant challenge for engineers designing today's electronic devices. Traditional approaches rely heavily on EMC design rules. Unfortunately, these design rules aren't based on the specific EMC requirements for a particular device, and they don't usually take into account the specific function of the circuits or the many design details that will ultimately determine whether the device is compliant. This paper describes a design methodology that relates design decisions to the product's EMC requirements. The goal of performance-based EMC design is to ensure that electronic designs meet EMC requirements the first time the product is tested. More work needs to be done before this concept reaches its full potential, but electronic system designers can already derive significant benefit by applying this approach to products currently under development.

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Section: Common-mode Currents Induced On Cables Attached To the Boardmentioning

confidence: 99%

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Hubing¹

2013

Journal of electromagnetic engineering and science

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“…Common-mode radiation is a major factor of EMI from a printed circuit board (PCB) [1]. High-speed signal traces running either above a narrow return plane or close to an edge of a ground plane cause common-mode radiation.…”

Section: Introductionmentioning

confidence: 99%

Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location

Matsushima

Watanabe

Toyota

et al. 2009

IEICE Trans. Commun.

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SUMMARYA guard trace placed near a signal line reduces commonmode radiation from a printed circuit board. The reduction effect is evaluated by the imbalance difference model, which was proposed by the authors, when the guard trace has exactly the same potential as the return plane. However, depending on interval of ground connection of the guard trace, the radiation can increase when the guard trace resonates. In this paper, the authors show that the increase of radiation is caused by the common mode, and extend the imbalance difference model to explain a mechanism of increase of common-mode radiation. Additionally, the effective via location of the guard trace is proposed to reduce the number of vias. The guard trace voltage due to the resonance excites the common mode at the interface where the cross-sectional structure of the transmission line changes since the common-mode excitation is expressed by the product of the voltage and the difference of current division factors. To suppress the common-mode excitation, the guard trace should be grounded at the point where the cross-sectional structure changes. As a result, the common-mode radiation decreases even when the guard trace resonates.

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“…Microstrip structures with comparatively narrow ground planes (GP) have various applications in modern high-speed electronic equipment, for example, to increase product assembly density, for interboard connector design, or for microstrip on-chip interconnects on silicon [3,14,15]. A major problem in most of the structures with narrow ground planes, or when signal traces come close to the edge of a printed circuit board is so-called "ground plane noise", which is actually a common-mode voltage, that appears on the reference plane due to fringing magnetic fields wrapping the plane [16][17][18][19][20][21]. This voltage drives unintentional "antennas" formed by parts of the electronic equipment, such as PCB reference planes, cables, and the conducting chassis that are connected to the reference plane of the microstrip structures.…”

Section: Introductionmentioning

confidence: 99%

“…At frequencies where the PCB structures must be modeled using distributed parameters, quantifying the inductive coupling mechanism is an important, but a difficult problem. Recently, there have been many publications aimed at this problem [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Method of Edge Currents for Calculating Mutual External Inductance in a Microstrip Structure

Koledintseva¹,

Drewniak²,

Doren³

et al. 2008

PIER

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Abstract-Mutual external inductance (MEI) associated with fringing magnetic fields in planar transmission lines is a cause of socalled "ground plane noise", which leads to radiation from printed circuit boards in high-speed electronic equipment. Herein, a Method of Edge Currents (MEC) is proposed for calculating the MEI associated with fringing magnetic fields that wrap the ground plane of a microstrip line. This method employs a quasi-magnetostatic approach and direct magnetic field integration, so the resultant MEI is frequencyindependent. It is shown that when infinitely wide ground planes are cut to form ground planes of finite width, the residual surface currents on the tails that are cut off may be redistributed on the edges of the ground planes of finite thickness, forming edge currents. These edge currents shrink to filament currents when the thickness of the ground plane becomes negligible. It is shown that the mutual external inductance is determined by the magnetic flux produced by these edge currents, while the contributions to the magnetic flux by the currents from the signal trace and the finite-size ground plane completely compensate each other. This approach has been applied to estimating the mutual inductance for symmetrical and asymmetrical microstrip lines.

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Investigation of fundamental EMI source mechanisms driving common-mode radiation from printed circuit boards with attached cables

Cited by 244 publications

References 8 publications

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Performance-Based EMC Design Using a Maximum Radiated Emissions Calculator

Increase of Common-Mode Radiation due to Guard Trace Voltage and Determination of Effective Via-Location

Method of Edge Currents for Calculating Mutual External Inductance in a Microstrip Structure

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