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研究了高速电路领域中的一类重要的电源完整性问题,即电源地平面之间激发的地弹噪声问题。地弹噪声的存在严重破坏了电源/地平面的完整性,导致供电电压幅度的不稳定,严重之时甚至导致电路的误判。针对这一问题,设计了一种超宽带电磁带隙结构。实验结果表明,这种电磁带隙结构可以在0.5~5.5GHz(11倍频程)频段内实现优于30dB的噪声抑制能力。文章还探讨了带隙结构作为电源平面时信号传输的完整性。研究表明,如果电路工作频率高达GHz或更高,在电源/地平面采用这种带隙结构,可以有效地避免地弹噪声带来的影响,并保证电源和信号的完整性。
An important class of power integrity problems in the field of high-speed circuits is studied, namely the problem of ground-bounce noise induced between power ground planes. The presence of ground bounce noise severely damaged the integrity of the power / ground plane, resulting in instability of the supply voltage amplitude and even misjudging the circuit. In response to this problem, an ultra-wideband electromagnetic bandgap structure has been designed. Experimental results show that this electromagnetic bandgap structure can achieve better than 30dB noise rejection in the band of 0.5 ~ 5.5GHz (11 octave). The article also discusses the bandgap structure as the power plane signal transmission integrity. Research shows that if the circuit operates at frequencies up to GHz or higher, using this bandgap structure at the power / ground plane effectively avoids the effects of ground bounce noise and ensures power and signal integrity.