Research On Noise Suppression In Power Distribution Network Of High-speed Circuit

With the information age coming,small-sized,high-performance,and low-power hardware which is information infrastructure is needed urgently by the industry.With the trend of high clock frequency,low power supply voltage and high transient current in electrical system,the problem of power supply noise is obvious.The problem of noise suppression of power distribution network which is the design core of hardware system has been a major bottleneck in high-speed digital system.In order to solve the problem of power supply noise in the wide frequency range and meet the system’s stable power supply voltage demand,two solutions to suppress medium and low frequency and high frequency power supply noise is given in this paper.The main work of the paper is as follows:Design research on the decoupling network aiming at problems of the power supply noise in the medium and low frequency range is completed.On the basis of in-depth research of power distribution network modeling and circuit resonance,the power supply plane is modeled by the MATLAB software based on the transmission matrix method and the resonance chamber method,and the accuracy of the model is verified with Hyper Lynx software.The combination method of decoupling capacitance and the influencing factors of the decoupling capacitance are then compared from the frequency domain,and the capacity of the capacitor and the number of selection methods are given.The capacitor obtained by this method is placed in the transmission line model based on the π-model equivalent circuit built by the ADS software,and analyzes its position.Establishing a PCB layout via Hyper Lynx software to verify and adjust the board-level capacitor combination,optimized decoupling network meets 200M? target impedance requirements within 100 MHz frequency range.For the problems of power supply noise in high frequency(GHz),combined with ultra-highfrequency marine communication needs,a new three-dimensional L-bridge mixed electromagnetic bandgap structure is proposed.Based on the basic principle of the electromagnetic band gap(EBG)structure,the size of the three-dimensional L-shaped bridge mixed EBG unit structure is analyzed and adjusted by HFSS software.With the-30 db standard,the noise suppression of the optimized EBG structure is from 0.12 to 31.38 GHz.The lower cut-off frequency is reduced by 80%,and the bandwidth increased by 853%compared with the traditional L-type bridge EBG structure.The low frequency noise suppression performance of the structure is further enhanced by insertion of the magnetic core,and the lower cut-off frequency reduces 41% again.The equivalent circuit model of the EBG structure of this paper is established based on multi-layer finite difference.Finally,the signal integrity of the EBG structure of this paper is analyzed and given improvement measures by ADS software,and the eye high increases by 5%,and the eye width increases by 3.1% in the eye diagram.Studies have shown that this structure can not only be suppressed to noise within the high frequency range,but also its low frequency noise suppression performance is extremely excellent.