Experimental investigation of high-speed digital circuit’s return current on electromagnetic emission.
Low impedance of the return current path and small loop area of return current loop are best practices design criteria to minimise electromagnetic emission from a high speed printed circuit board (PCB). In high-speed digital circuit, the high-frequency return current signal will find its way back to...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/410/ http://eprints.uthm.edu.my/410/1/23_full_saizal.pdf |
| Summary: | Low impedance of the return current
path and small loop area of return current loop are
best practices design criteria to minimise
electromagnetic emission from a high speed
printed circuit board (PCB). In high-speed digital
circuit, the high-frequency return current signal
will find its way back to the source by flowing
along the path of least inductance. It can either
flows over the ground plane or on the guard trace
which is physically close proximity to the highspeed
signal trace. It is important to indicate that
the use of guard trace can be one of the options of
emission reduction techniques on double sided
assemblies as it will reduce the emission level. In
this paper, several double sided test boards were
developed to evaluate the impact of different
return current paths on radiated emission
conducted in a Gigahertz Transverse
Electromagnetic (GTEM) cell. Various designs
will be presented and important conclusions will be
derived. |
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