Measurements of magnetic field emission of various digital circuit layouts

Md Mustam, Saizalmursidi and Mohd Jenu, Mohd Zarar (2010) Measurements of magnetic field emission of various digital circuit layouts. In: International Conference on Intelligent and Advanced Systems, 15-17 June 2010, Kuala Lumpur.

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Abstract

Signal or power to ground traces on a printed circuit board (PCB) of digital products may act as an efficient loop antenna radiating magnetic field when the length is greater than the wavelength of the high frequency current. Employment of proper routing of the return current path, filtering and damping resistor is best practices in the design criteria to minimise sources of electromagnetic emission at PCB level. It is important to indicate that the use of guard traces, filtering at supply network of critical component and damping resistor on signal traces can be the options of emission reduction techniques on double sided assemblies as it will reduce the emission level. In this paper, three double sided test boards are developed to evaluate the impact of the aforementioned mitigation methods on near magnetic field emission. The magnetic field distributions over each layout are measured in order to reveal the profile of radiation to gain further understanding on the net current distribution on the traces of the digital circuit. It is seen that by proper design of return current path, the magnetic field is reduced by average of 16.5 dB.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Faculty of Electrical and Electronic Engineering > Department of Communication Engineering
ID Code:612
Deposited By:Nurul Elmy Mohd. Yusof
Deposited On:01 Jan 2011 22:18
Last Modified:29 Apr 2011 14:41

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