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EMC - Överhörning mellan ledare
KTH, School of Information and Communication Technology (ICT).
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
EMC - Crosstalk between conductors (English)
Abstract [sv]

Detta examensarbete handlar om EMC i allmanhet och overhorning i flatkabel samt ledningar i synnerhet. Arbetsuppgiften gick ut pa att undersoka overhorning i en flatkabel och ett kretskort.

EMC, som star for elektromagnetisk kompatibilitet, beskriver mojligheten for elektriska och elektroniska system att fungera utan att stora andra system. Den beskriver aven formagan att fungera pa en angiven elektromagnetisk miljo for elektriska och elektroniska system. Problemet med overhorning i kablar och ledningar ar kant sedan tidigare och inom PCB design ar overhorning ett viktigt EMC problem.

Tva undersokningar gjordes dar den forsta undersokningen utfordes pa flatkabeln. Matningar gjordes med ett oscilloskop for att sedan jamforas med teorin i form av berakningar och simuleringar. Detsamma gjordes vid den andra undersokningen med kretskortet dar det efter matningarna utfordes berakningar for att sedan kunna simulera och jamfora praktiken med teorin.

Inledningen av rapporten borjar med lite teori om EMC och nagra exempel pa vad overhorning kan orsaka. Darefter visas formler som anvands for berakningarna i bada undersokningarna.

I rapportens huvuddel visas resultaten av berakningarna efter matningarna som sedan anvands vid simuleringarna. Efter det jamfors matvardena med simuleringsvardena for bade flatkabeln och kretskortet. En liten beskrivning pa hur kretskortet designades tas ocksa upp.

Det hela avrundas med en slutsats dar resultaten diskuteras och undersokningarna jamfors med varandra.

Abstract [en]

This thesis is about EMC in general and crosstalk in flat cable and wiring in particular. The task was to investigate the crosstalk in a flat cable and a circuit board.

EMC, which stands for electromagnetic compatibility, describes the ability of electrical and electronic systems to operate without interfering with other systems. It also describes the ability to operate in a specified electromagnetic environment for electrical and electronic systems. The problem of crosstalk in cables and wires is already known and in PCB design, the crosstalk is an important EMC problem.

Two surveys were carried out in which the first survey were performed on the flat cable. Measurements were made with an oscilloscope and then compared with the theory in the form of calculations and simulations. The same was done at the second survey with the circuit board where the following measurements were performed calculations to be able to simulate and compare the practice with theory.

The beginning of the report begins with some theory of EMC and a few examples of what crosstalk can cause. Then the formulas used for the calculations in both surveys is shown.

In the main part of the report, the results of the calculations for the measurements is shown which are then used in the simulations. After that, the measurements is compared with simulation values for both the flat cable and the circuit board. A small description of how the circuit board was designed are also discussed.

The whole is rounded off with a conclusion were the results are discussed and the surveys are compared with each other.

Place, publisher, year, edition, pages
2013. , 36 p.
Trita-ICT-EX, 2013:103
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-128178OAI: diva2:647110
Educational program
Bachelor of Science in Engineering - Electronics and Computer Engineering
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2013-09-10Bibliographically approved

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