Analysis And Research Of Electromagnetic Band-Gap Structure For Suppression Of Simultaneous Switching Noise

With the advent of the 21 st century,people entered a "high speed" world.But in the electronic system toward large-scale,small size,high-speed direction of the rapid development of the same time,some of the problems that have been overlooked before are beginning to emerge.Engineers have seen many new problems in designing printed circuit boards.When a large number of transistors in the high-speed circuit are simultaneously in the switching state,in the circuit will produce a large number of instantly changing currents(?I noise current).The simultaneous switching noise(SSN)caused by these currents will affect the power distribution network(PDN).The performance of the power distribution network will directly affect the performance of the high-speed system's signal integrity(SI),power integrity(PI),and electromagnetic interference(EMI),so it is important to eliminate or reduce SSN.The purposes of thesis is to study the electromagnetic band-gap structure to suppress SSN in the high-speed system,Although there are already many EBG structures which can suppress SSN,However,in these structures,the function of ultra-wideband suppression of SSN is rarely achieved,These structures are not the lower limit cutoff frequency is too high,that is,the upper cutoff frequency is low.To solve this problem,this thesis proposes an EBG structure which can realize ultra-wideband suppression SSN.Firstly,the function of power distribution network in high speed digital system is introduced,this thesis focuses on the components of the PDN and the role of the components.And then analysis the causes of simultaneous switching noise and some of its hazards from the circuit aspects.And then introduced several traditional methods to suppress simultaneous switching noise and the principle of EBG structure for suppressing SSN.This thesis presents a hybrid embedded EBG structure.The novel EBG structure is based on the traditional Z-Bridge EBG,and the L-Bridge EBG structure is hybrid embedded in Z-Bridge EBG selectively.Using Ansoft HFSS 15.0 software to simulate novel EBG structures,the simulation results show that the novel EBG structure realizes the effect of ultra wideband suppression of SSN.The measured data measured by the Vector Network Analyzer(VNA)also validates this view,the stop-band range of novel EBG structure is from 370 MHz to 20 GHz.Compared to the traditional Z-Bridge EBG structure of the370MHz-4.65 GHz and L-Bridge EBG structure 585MHz-4.3GHz,the novel EBG structure of the suppression bandwidth has been greatly improved.Then,using the lumped equivalent circuit model and the planar resonator model to analysis lower cutoff frequency and the upper cutoff frequency of the hybrid embedded EBG structure.Finally,the influence of the novel EBG structure on signal integrity is analyzed by eye diagram.