Hwan-Woo Shim
Hubing, T.H.
Mobile Commun. Div., Samsung Electron. Co., Gumi-City Gyeong-Buk, South Korea
This paper appears in: Electromagnetic Compatibility, IEEE Transactions on Publication Date: Nov. 2005
Volume: 47
,
Issue: 4
On page(s):
899
- 907
ISSN: 0018-9375
Digital Object Identifier: 10.1109/TEMC.2005.859060
Current Version Published: 2006-01-23
Abstract
Common-mode currents induced on cables attached to printed circuit boards (PCBs) can be a significant source of unintentional radiated emissions. This paper develops a model for estimating the amount of common-mode cable current that can be induced by the signal voltage on microstrip trace structures or heatsinks on a PCB. The model employs static electric field solvers or closed-form expressions to estimate the effective self-capacitances of the board, trace, and/or heatsink. These capacitances are then used to determine the amplitude of an equivalent common-mode voltage source that drives the attached cables. The model shows that these voltage-driven common-mode cable currents are relatively independent of the cable parameters and the trace or heatsink location when the PCB is small relative to the cable length and to a wavelength.
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