Signal Integrity And Electromagnetic Compatibility Optimization Design Of High Frequency Circuit Based On EBG Structure

With the increasing frequency of high-frequency circuit clock,the simultaneous switching noise(SSN)has been considered as one of significant problems which need to be solved in electromagnetic compatibility(EMC)design of high-frequency circuits.It has been found from recent reasearches that electromagnetic band gap(EBG)structure can effectively suppress the SSN problem of high-frequency circuits.Based on the suppressing SSN principle of the traditional coplanar EBG structure,this dissertation proposes two new types of coplanar EBG structures by changing the wire length of EBG structures for EMC design consideration of high-frequency circuits.The application of proposed coplanar EBG structures: NS coplanar EBG structure and NW coplanar EBG structure,which were embedded in the common power layer of high-frequency circuits,proves that the SSN suppression improvement of high-frequency circuits.Therefore,this work can be helpful for EMC optimization of high-frequency circuits and ensuring signal integrity(SI)for signal propagation in high-frequency circuits.In this dissertation,Ansoft HFSS software is used to simulate and analyze proposed coplanar EBG structures.An NS coplanar EBG structure was introduced,and a high-frequency component circuit with NS coplanar EBG was fabricated according to the simulated model.The comparison of simulation and measurement proves that the designed NS coplanar EBG structure has better SSN suppression than traditional EBG structures.The simulation shows that the lower SSN limit cutoff frequency of the NS coplanar EBG structure is 280 MHz and the stop bandwidth is 4.82 GHz.Measurement prove that the high-frequency circuit using the NS coplanar EBG structure has better SI than that of the conventional high-frequency circuit with continuous power layer.Based on the study of the NS coplanar EBG structure,this dissertation presents other new coplanar EBG structure: NW coplanar EBG,by superimposed NSs to increase the length of metal connecting lines within the coplanar EBG structure.The effect of metal width of connecting lines on the ability of SSN suppression was analyzed and four different widths of metal connecting lines were.At the same time,the actual circuit manufacturing process is compatible.Then,the metal line width of the NW coplanar EBG structure was selected to be 0.2 mm.Based on the HFSS simulation model,a high-frequency component circuit with the NW coplanar EBG was fabricated.Measurements have shown that the high-frequency circuit using the NW coplanar EBG structure has better SI than the previous NS coplanar EBG structure.