一种适用于高速电路中SSN抑制的紧凑型电磁带隙新结构

A Novel Compact Electromagnetic Band-gap Structure Using for SSN Suppression in High Speed Circuits

该文根据电磁带隙(EBG)结构的带隙形成机理以及共面EBG结构的等效电路,提出了一种适用于高速电路中同步开关噪声(SSN)抑制的紧凑型EBG结构,使用Ansoft HFSS对该结构进行仿真分析。仿真结果表明在抑制深度为-30 dB时,阻带范围为0.6-6.4 GHz,阻带带宽为5.8 GHz,与传统的L-bridge结构相比,阻带带宽增加了1.8 GHz,相对带宽增加了45%,实现了较低的带隙中心频率以及较宽的阻带带宽,并用Ansoft Designer通过时域仿真验证该结构具有较好的信号完整性。

According to the physical mechanism of the Electromagnetic Band-Gap（EBG） structure and the equivalent circuit model of the planar EBG structure,a novel compact EBG structure is proposed for Simultaneous Switching Noise（SSN） suppression in high speed circuits.-30 dB stop-band is from 0.6 GHz to 6.4 GHz,and the bandwidth is 5.8 GHz.Comparing with the traditional L-bridge EBG structure,the bandwidth increases by 1.8 GHz and the relative bandwidth increases by 45%.A low band-gap center frequency and wide bandwidth is realized and good signal integrity is achieved.