| With the coming of the era of big data and the rise of cloud computing, “fast processing speed, high requirement of timeliness” is the most notable feature of big data to distinguish from the traditional data. High-speed transmission and a large a mount of data processing requirements have brought a lot of problems of the circuit board(PCB) design. First, because the clock edge rate becomes fast, high frequency components of the signal become higher. This will not only cause impact on the quality o f signal transmission which produces reflection and crosstalk noise, but also cause great impact on the stability of power distribution network.Mitigating the noise of power distribution network is one of the main efforts for power integrity(PI) design in high speed or mixed-signal circuits. Possible solutions, which are based on decoupling or isolation concept, to suppressing PDN noise on package or printed circuit board(PCB) levels are reviewed in this paper. This paper introduces the composition of PDN structure, and introduces some methods for reducing the power supply noise by using decoupling or separation concept through analyzing principles of some common power supply noise. The main purpose of decoupling is to keep the PDN impedance lower in a wide frequency range. The isolation approach that keeps part of the PDN at high impedance is another way to reduce the PDN noise propagation. The methods to remove noise and the corresponding principle are discussed after a instruction of various components of PDN and the effects of all kinds of noise in the high frequency circuit design.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 a 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(PDN), 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 addition, the paper puts forward a new embedded electromagnetic band gap structure. A novel EBG structure is designed on the basis of periodic L-bridge and meanwhile a ML-bridge cell is embed into each L-bridge unit. After adding a reverse L-bridge structure, the suppression bandwidth is lifted largely which extends from 260 MHz to 10 GHz at suppression depth of-30 d B compared to conventional EBG structure. According to characteristics of the structure, it concludes the lumped equivalent circuit model in low frequency based on the architectural feature. Moreover it can get the calculation formula of resonance point, in o rder to estimate the upper cut-off frequency of the new structure with resonator mode. Finally, it analyzes the new structure`s signal transmission characteristic in the embedded system internal and external line, so as to verify the boycott bandwidth of EBG structure and the influence of signal integrity by simulating and measuring. Draw a conclusion, the stop bandwidth and restraint depth in internal structure with embedded opposite ML-bridge structure has been improved observably compared to the traditio nal L-bridge structure, and while verify the outside wiring signal integrity. According to the theoretical, it can improve stop band performance through adjust the size and parameters of embedded structure. |
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