NDLI: Radiated emission effects from multiple via stimulation within a printed circuit board

Content Provider	IEEE Xplore Digital Library
Author	Montrose, M.I. Liu, E.-X.
Copyright Year	2008
Description	Author affiliation: Montrose Compliance Services, Inc., Santa Clara, CA (Montrose, M.I.)
Abstract	Radiated emissions propagate from printed circuit boards (PCB) due to common-mode RF currents developed by digital components switching logic states. Transmission lines connect an output to an input pin, generally on another component, and are usually routed on different planes within a PCB, jumping layers through vias. Vias themselves may propagate an undesired RF field causing significant EMI. Research on field propagation from a single via exists. However, radiated effects from the phasing of multiple internally created common-mode current sources simultaneously have not been examined with extensive analysis. This paper investigates the phasing of 100 vias (stimulus sources) simultaneously in the Gigahertz range, emulating a real printed circuit board using today's high-speed technology, and not a typical theoretically perfect model and single stimulus. Simulated results are presented with field propagation plots illustrating what an antenna could observe at three meters distance due to multiple field propagating sources, illustrating the complexity of the field patterns and the difficulty in determining, or measuring accurate field strength in the far field.
Starting Page	176
Ending Page	179
File Size	3250288
Page Count	4
File Format	PDF
ISBN	9789810806293
DOI	10.1109/APEMC.2008.4559840
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-19
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Asia Pacific EMC Society
Subject Keyword	Antenna measurements Circuit simulation Printed circuits Switching circuits Radio frequency Radiating field pattern multiple source stimulation Distributed parameter circuits multiple vias Logic circuits Electromagnetic interference field reception far field measurement Antennas and propagation Transmission line theory propagating field
Content Type	Text
Resource Type	Article

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