Integrated circuits (ICs) are often the source of the high-frequency noise that drives electromagnetic emissions from electronic products. A case study is presented where emissions from a printed circuit board containing an automotive microcontroller are reduced significantly through analysis of the coupling mechanisms from the chip to the board and attached cables. Noise generated by the IC is explored through measurements in a semi-anechoic chamber and TEM cell, through near-field scans, and through modifications to the printed circuit board. Noise is driven by the IC through both power and I/O connections. Results show that a ferrite in series with I/O power in this application reduced emissions by 10 dB or more at critical frequencies. Possible causes for emissions from the IC and modifications that might reduce these emissions are discussed.
H. Weng et al., "Application of Chip-Level EMC in Automotive Product Design," Proceedings of the 2006 IEEE International Symposium on Electromagnetic Compatibility, 2006, Institute of Electrical and Electronics Engineers (IEEE), Jan 2006.
The definitive version is available at http://dx.doi.org/10.1109/ISEMC.2006.1706428
2006 IEEE International Symposium on Electromagnetic Compatibility, 2006
Electrical and Computer Engineering
Keywords and Phrases
Automotive; Coupling; Emissions
Library of Congress Subject Headings
Article - Conference proceedings
© 2006 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.