高速电路中地弹噪声抑制的研究

Research on Ground Bounce Noise Suppression in High-Speed Circuit

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。

In this paper, we study the ground bounce noise （GBN） excited between power/ground planes, which is one important issue in the area of power integrity （PI） in high-speed circuits. The GBN has a negative impact on PI, leading the voltage swing and even circuit logic error. To overcome the problem, an ultra-wide band electromagnetic band-gap （EBG） structure is proposed to supress. The noise experimental results show that the suppression is over 30dB in 0.5 ~ 5.5 GHz. The signal integrity performance is also investigated when introducing the EBG structure on the power plane. Our re- search has proved that the EBG structure could suppress the GBN in high-speed circuit working at GHz or higher frequency, and as a result, keep the power and signal integrity.