โ Scribed by Takuya Miyashita; Osami Wada; Ryuji Koga; Hiroya Sano
No coin nor oath required. For personal study only.
For the EMC design of high-speed digital printed circuit boards (PCBs), it is necessary to predict electromagnetic interference (EMI) caused by the PCB. In this article, we pay particular attention to EM emission from signal lines on a PCB. First, models are made on the spectral profile of the current in a signal line based on the highfrequency equivalent circuits with capacitive and resistive load, respectively.
Next, we formulate near-field EMI emitted from the signal line current. As a result, the spectral profile of nearfield EMI is proved to be the same as that of the signal current. The far-field EMI by the signal current is also formulated, and we derive the relation between resonance frequency and spectra of far-field EMI.
By these results, it is theoretically proved that the near-field and far-field EMI have specific profiles, respectively. Consequently, the spectral profile of radiated EMI can be estimated easily by simple models with circuit parameters without requiring rigorous analysis, and this will provide a new method of high-speed simulation of radiated emission from digital PCBs.
๐ SIMILAR VOLUMES
## Abstract In this article, the radiated emissions mechanism and the variation of radiated emissions level have been analyzed and investigated, respectively, according to the ratio of the horizontal to vertical traces in a bent signal line when a bent signal line on a printed circuit board (PCB) w
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