Research On High-speed Digital System Power Supply Noise Suppression

With the rapid development of science and technology,electronic information is closely related to everyone's life,and the electronics industry is becoming more and more competitive.With the continuous improvement of system frequency and the reduction of power consumption,human-computer interaction is becoming more and more human.As the system clock frequency continues to increase and the number of transistors continues to increase,the challenges of the power distribution system as a whole system of work protection is also increasing.The continuous reduction of the system voltage and the gradual increase of the system frequency make the interference of the power switch noise to the power supply become more and more significant.Signal integrity and power integrity issues have now become a key factor in limiting the entire high-speed circuit system.It is very important to systematically analyze and target the noise of the power distribution system.The addition of decoupling capacitors and isolation in the power distribution system can improve the performance of the power distribution system and is a viable solution to ensure the power integrity of the circuit system.This thesis uses Cadence signal integrity tool called Allergo PCB Editor to carry out the signal reflection simulation and testing of the actual circuit.This thesis mainly studies the signal integrity problem in the circuit and system and the problem of power supply noise suppression in the power distribution network.Firstly,it is introduced that the knowledge of the signal integrity in the high-speed system.Secondly,this thesis introduces the methods of suppressing the signal noise in power distribution network.Thirdly,it is introduced electromagnetic bandgap(EBG)structure.It is limited in complex circuit systems by using the traditional methods because of taking up more space and having a narrower frequency band,so it can solve the problem of narrow band and large space by using the EBG structure.Based on the existing L-Bridge EBG and Meander-Line-Bridge EBG structure,a new plug-in cascade Meander-Line-Bridge EBG structure is proposed.Firstly,changing the slit width and bridge connection structure make the plug-in Meander-Line-Bridge EBG structure have a high ability to the SSN's inhibition.Then the new plug-in cascade Meander-Line-Bridge EBG structure is proposed by connecting the new plug-in Meander-Line-Bridge EBG structure with the traditional Meander-Line-Bridge EBG structure.By simulation,when the suppression depth is-30 d B,the suppression bandwidth is from 0.41 GHz to 10.9GHz,and compared to the L-Bridge EBG that the suppression bandwidth is from 0.49 GHz to 5.9GHz,the suppression bandwidth of the new structure is increased by 5.08 GHz.In order to verify the true reliability of the structure,through the physical testing,the S parameter and the simulation results are similar,to reach a consistent conclusion.The DC voltage drop of the new structure was measured by using the CST EM Studio software,and the impedance value of the new structure was gotten.Then,the signal integrity test of new plug-in cascade Meander-Line-Bridge EBG structure was carried out.Then,the signal integrity simulation of the plug-in cascade Meander-Line-Bridge EBG structure was carried out by using the single-ended transmission line simulation,the maximum eye open and the maximum eye width of the plug-in Meander-Line-Bridge EBG structure was obtained,which are respectively 200 m V and 400 ps.The simulation results meet the requirements of signal transmission.For signal lines with high signal quality requirements,differential traces can be used,and the maximum eye open of plug-in cascade Meander-Line-Bridge EBG structure can reach 490 m V,and the maximum eye width can reach 400 ps.