高速电路中地弹噪声抑制的研究
Research on Ground Bounce Noise Suppression in High-Speed Circuit
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摘要: 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。Abstract: 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 research 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.
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