An evaluation on the contribution of differential mode and common mode currents in radiated emission of digital circuits
Electromagnetic Compatibility (EMC) is an issue that has rapidly increased in importance in recent years, driven by legal, and conunercial demands. The EMC compliance requires the implementation of a total EMC approach to the development of electric and electronic circuitry such as in product...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English English |
| Published: |
2009
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7278/1/24p%20AIZA%20MAHYUNI%20MOZI.pdf http://eprints.uthm.edu.my/7278/2/AIZA%20MAHYUNI%20MOZI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7278/3/AIZA%20MAHYUNI%20MOZI%20WATERMARK.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Electromagnetic Compatibility (EMC) is an issue that has rapidly increased in
importance in recent years, driven by legal, and conunercial demands. The EMC
compliance requires the implementation of a total EMC approach to the development
of electric and electronic circuitry such as in product manufacturing, with
compliance being an integral part of the product life-cycle. Radiated emission test is
one of the EMC criteria with a purpose to ensure that other products are protected
from the emissions generated by it. TIns project is focused on the contribution of
Differential Mode Current (Id) and Conunon Mode Current (Ie), that occur in electric
and electronic circuitry wmch definitely affects the overall radiated emissions level.
A standard test circuit was designed and implemented as the reference circuit.
Several of the test circuits were designed and developed using appropriate layout
design techniques such as loop area control and appropriate grounding techniques to
ensure signal quality and functional performances due to EMC. The value of Id
exhibited significantly much mgher values than Ie for frequency ranges between 30
MHz to 1000 MHz throughout all the measurements. Despite the significantly
different values between Id and Ie , the total radiated emissions over the frequency
ranges exlnbited consistent results. Tms indicate that although the values of Ie were
noticeably lower than Id, Ie still dominated the radiated emission in electric and
electronic circuitry. The effects of loop area and grounding techniques on radiated
emission were also studied. There was a 0.3 % of reduction regarding loop area
technique using double-sided PCB compared to the standard test circuit. The average
value of radiated emission produced by the test circuit due to Id exhibited a reduction
of3.42 % from the standard test circuit, wmle the average value of radiated emission
produced by the test circuit due to Ie exhibited a reduction of 2.17 % from the
standard test circuit. Future work should focus on improving the circuit design and
development using multilayer PCB for optimal performance. Furthermore, effort can
also be made on expanding the circuit design by implementing noisy sources such
relays and motors, and improve the circuit with higher density and more traces. |
|---|