一种适用于高速电路中SSN抑制的紧凑型电磁带隙新结构
doi: 10.3724/SP.J.1146.2011.00022
A Novel Compact Electromagnetic Band-gap Structure Using for SSN Suppression in High Speed Circuits
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摘要: 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。Abstract: 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.
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