Research On EBG Structures For SSN Suppression

With the development of modern high-speed digital circuits, fast edge rising rates,high clock rates and low voltage level make the simultaneous switching noise(Simultaneous Switching Noise: SSN) between the power plane and ground planebecome more serious. Therefore, how to eliminate simultaneous switching noise is onedifficult problem many researchers meet, eliminating SSN for the development ofhigh-speed digital circuits is of great significance.The research of new electromagnetic materials and their applications have been theconcern of many researchers. EBG (Electromagnetic Band Gap, EBG) structure is akind of periodic structure with a frequency stop-band, in a certain range of frequencybandwidth, EBG can stop electromagnetic wave propagation. Its unique nature makes ithave broad application prospects. In this paper based on the EBG structure designtheory and simultaneous switching noise elimination theory, one kind of EBG structurehas been studied in the laboratory is optimized by using electromagnetic simulationsoftware and a new PCB with the EBG structure as power plane has been fabricated andmeasured; a type of new ultra-broadband Convolute EBG structure is designed, so as toeliminate the simultaneous switching noise.The main work and achievements of this thesis are summarized as follows:1One kind of EBG structure has been studied in the laboratory is optimized and anew PCB with the EBG structure as power plane has been fabricated and measured.Experimental results are basically consistent with the simulation results. The bandgapproperties of the new EBG structure is good, the suppression depth and bandwidth areboth significantly improved than the classic planar EBG structures. Finally, the signalintegrity of new EBG structure is simulated by software, There is a slight decrease insignal integrity using single transmission line, but the signal integrity of the proposedEBG power plane can be improved by using differential transmission lines.2Furthermore, based on the working principle, design equations of EBG structure,and characteristics of the simultaneous switching noise: low cut-off frequency,wideband, increasing the inductance of the EBG by the branches around the EBG, anew type of ultra-wideband EBG structure for SSN suppression named Convolute EBGis designed.First the characteristics of stop-band are simulated by software. Thesimulation results indicate: compared to the Z-bridged EBG structure with the same parameters, the new EBG’s stop-band of-30dB is from150MHz to10.7GHz, therelative bandwidth is increased by62.3%. Then the signal integrity of the ConvoluteEBG is discussed, and it is found that using the new Convolute EBG structure as powerplane, signal integrity is good.