The relationship between S21 properties and far-field radiated emission has been experimentally characterized for various types of power bus structures. As design parameters of power bus structures in printed circuit boards, the effects of VDD plane configuration, insulator thickness between VDD plane and ground plane, on-board capacitors, and signal routing were investigated. First, S21 properties of solid and electromagnetic band-gap (EBG) -type VDD planes were measured for both with and without on-board capacitors. Then, far-field radiated emission was measured for the combination of these design parameters. On-board capacitors induced stop-band in the low frequency range. It has been found that high level of far-field radiated emission was excited at the almost same frequencies of S21 peaks.
Electromagnetic radiations ofpower bus with embedded decoupling capacitor composed of different insulator thicknesses were investigatedfor two case. with on-board global capacitors and without them. In order to distinguish the common mode radiation ofthe power bus due to shoot-through currentfrom normal mode radiation, two different lengths ofsignal traces were compared. It has been proved that radiated emission due to shoot-through current was reduced over the widefrequency range by the PCBs with thinner insulators without on-board global capacitors, and was reduced in the limitedfrequency range by the PCB with relatively thick insulator and on-board global capacitors.
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