Analysis Of Novel EBG Structure For Switching Noise Suppression

At present, all kinds of electronic products enrich people's lives, facilitate the people's production. With the trend of faster signal edge rate, increasingly higher operating clock frequency, noise margin and lower power supply voltage, circuit function have a great relationship with distortion signal. It is because that simultaneous switching noise(SSN) has become one of the significant challenges for the design of power distribution system(PDS) in the high speed digital circuits: Large Scale Integrated Circuit(LSIC) internal transistor's opening simultaneously will produce transient currents. SSN caused by transient currents will seriously affect the PDS. SSN between the planes can excite resonances and becomes deterioration if it is generated between power and ground planes. Now, it is keen to study the use of electromagnetic band gap(EBG) structure to suppress noise propagation on printed circuit board(PCB), to solve the associated power integrity(PI) and signal integrity(SI) problems. People have developed a series of new EBG structures and theoretical analysis method, a large part of which have been confirmed and applied in experiments and production.This paper is based on previous studies and focuses on the signal integrity problems in the high-speed link. Firstly, it describes the history of high-speed circuit and the development status at home and abroad. Secondly, it introduces the concepts of high-speed digital link with emphasis on its theoretical analysis of reflections and crosstalks, and proposes appropriate solutions and wiring traces measures with the combination of timing analysis diagram. Thirdly, it analyzes the reasons for the formation of SSN and suppression methods along with their advantages and disadvantages. Finally, Mushroom EBG structure and coplanar EBG structures are compared in equivalent circuit model, structural characteristicsand SSN suppression characteristics. Meanwhile, the advantages and disadvantages of the two structures are discussed.In the last chapter of this paper, based on the existing theories and structure of EBG, we designe a new SL-EBG structure combined with the frequency selective surfaces(FSS). The novel structure possesses a notable improvement on the suppression width and depth of stopband, and has frequency selective characteristics on the space. Firstly, the design features of the new EBG structure is described in detail. Measurement and simulation results are compared by FSV to prove the accuracy of the measurement data. In addition, the lower and upper cutoff frequency is estimated by use of lumped-component circuit model and parallel plate waveguide model, respectively. Moreover, the IR-drop and DC resistance are examined through simulation in CST2011. And the quality of the signal transmission is analyzed based on eye pattern. Compared with the same EBG structure without FSS, the upper and lower cut-off frequency of the new structure has a significant widening. It is proved that etching ground plane is effective way to enhance the ability of suppression noise of existing EBG structure. However, the corresponding signal transmission quality and DC resistance will be deteriorated, and this is problems that we need to weigh in the future specific application.