Novel Design Of Electromagnetic Band-Gap Structure For Noise Suppression Of Simultaneous Switching

With the growing demand of the modern high-speed digital circuits, the characteristics of the modern high-speed digital circuits with fast edge rising rates, high clock rates,and low voltage level make the simultaneous switching noise(SSN) between the power plane and ground plane become the main bottleneck of restricting the development and application of the modern high-speed digital circuits. Therefore, how to effectively eliminate the SSN of the modern high-speed digital circuits has become the problem that must be solved by the circuit design personnel.EBG(Electromagnetic Band Gap) structure is a periodic structure in which the propagation of electromagnetic waves is forbidden in certain frequency bands. It can prohibit the propagation of the electromagnetic wave in a certain bandwidth range.Because it has the characteristics of simply made, small size, light weight and ease of integration, it attracts widespread attention and receives in-depth study. This thesis makes a study of the EBG structures used for electromagnetic interference suppression,focuses on the uniplanar EBG structures used for suppression of the SSN.According to the design principle and the bandwidth formula of the novel EBG,the thesis have designed two EBG structures to suppress the simultaneous switching noise with a ultra-wideband. Ansoft HFSS software which is based on the finite element method is used to simulate and optimize the SSN suppression of the two novel EBG structures, and test boards have been fabricated and tested, the measured results are in good agreement with the simulated results, which shows a good suppression of SSN of the two EBG structures. Ansoft Designer software is used to analyze the impact of the two EBG structures on signal integrity in detail. The result shows that good signal integrity performance can be obtained by using differential transmission lines on PCB.