Analysis And Research For The SSN Suppression In The High-Speed Circuit

Compared with the low speed of circuit design,the design requirements of high speed digital circuit is more complicated.Especially,with the development of high speed circuit,and the rise of cloud computing and big data,more and more people pay attention to the design of high speed circuit.Compared with the traditional data,high speed and timeliness is the significant feature.However,due to the continuous improvement of the working frequency of high speed circuit,and the lower of the power supply voltage,Printed circuit board(PCB)design become a difficult and complicate problem,at the same time,the signal integrity problem is becoming more and more serious,especially the problem of synchronous switching noise in power distribution network(PDN).The research content of this article is how to more effectively inhibit simultaneous switching noise in the power distribution network.This paper mainly studies the SSN noise suppression problems in power distribution network.First,the paper gives a introduction of the development process of high speed circuit and the main problems faced now,then,the methods to remove noise,the corresponding principle and analysis of the advantages and disadvantages of these methods are gave after a instruction of various components of PDN and the effects of all kinds of noise in the high frequency circuit design.Second,in order to reduce the effect of SSN noise on power distribution network,some methods for suppressing SSN noise are proposed.The traditional method is to add the decoupling capacitor,plane division of the power supply and the ground,etc.However,the inhibiting bandwidth of these traditional methods is too narrow and the cost of these methods is too high,so they can't be used widely.For the shortcomings and deficiencies of existing methods,this paper introduces a method of EBG structure to suppress noise,which could solve the problem above perfectly.In this paper,a new type of embedded EBG structure is proposed by analyzing the design characteristics,the characters of the stopband and equivalent circuit model of the mushroom-like EBG structures and the coplanar EBG structures.The new EBG structure is designed on the basis of traditional Meander L-bridge EBG structure and meanwhile an AI-EBG structure cell is embed into each Meander L-bridge unit.Through building simulation model of the new EBG structure,the simulation result showed that the suppression bandwidth is from 380 MHz to 13.9GHz at suppression depth of-30 d B.Compared to Meander L-bridge EBG structure,the suppression bandwidth is increased by almost 9.2GHz.In addition,the lower and upper cutoff frequency are estimated by use of lumped-component circuit model and parallel plate waveguide model.Finally,by time domain simulation model,the signal integrity of the new type of EBG structure are analyzed and the result shows that the structure in high-speed circuit is met with signal integrity.