Analysis And Research Of Novel EBG Structure For Noise Suppression In High-Speed Mixed Circuit System

In recent years,with the coming of cloud computing and the rise of big data,the circuit system is moving towards to the high-speed,high-density direction and the clock frequency has been continuously improved.The high-frequency signal components from high-speed signal has brought a lot of problems to the design of printed circuit board(PCB)such as reflection,crosstalk,noise and other signal problems which continuously plague the development of high-speed PCB circuit.Signal integrity(SI)analysis has become crucial.The power distribution network(PDN)occupies more than 30% of the area of the PCB,and the simultaneous switching noise(SSN)on it will affect the normal power supply of the power distribution network and the performance of the high-speed system.Mitigating the noise of power distribution network(PDN)is one of the main efforts for power integrity(PI)design in high speed or mixed-signal circuits.The research purpose of this thesis is using the electromagnetic bandgap(EBG)structure to suppress SSN in the high-speed hybrid circuit system.Several traditional methods is introduced to suppress simultaneous switching noise.In order to overcome the shortcomings of traditional methods,electromagnetic bandgap structure which has obvious advantages to suppress SSN is introduced and two novel structures of planar EBG embedded in double complementary split ring resonator(DBCSRR)are proposed.In this thesis,DBCSRR embedded in the planar EBG structure reduces the area of the power / ground plane,increases the length of bridge and makes the suppression range of the two new structure wider.The simulation results by using Ansoft HFSS 15.0 show that the L-bridge EBG with the ground plane embedded in DBCSRR has a band-stop range of 370MHz~20GHz and the Z-bridge EBG embedded in DBCSRR structure can achieve 270MHz~20GHz bandwidth in a reference of-30 d B suppression of the bandgap depth,the proposed structures possess a wide stop band ranging.The results of Z-bridge EBG embedded in DBCSRR structure measured by vector network analyzer(VNA)are basically same as the simulation results.Compared to the traditional Z-bridge EBG structure and L-bridge EBG structure,the suppression bandwidth of the two novel EBG structures has been greatly improved.Then,the lower frequency and the upper cutoff frequency are estimated by the lumped-component circuit model and parallel plate waveguide model.Finally,the results of time-domain simulation show that the structure can meet the need of signal integrity in high-speed circuit.