High-speed Digital Pcb Board Interconnect Noise Modeling And Simulation Studies

More and More high-switch-rate and high-pin-density devices have been applied to the digital system along with the fast development of manufacture technics of integrate circuit (up to 65nm), while the supply voltage of electronic system shows itself a fallen trend (from 5v to 1.2v), signal integrity (SI), power integrity (PI) and electromagnetic compatibility (EMC) problems have become increasingly serious. So how to solve these problems on the design of system level and PCB level and how to make the electronic system to be correct by design are more and more important.Simply, the problems of high-speed design include the distortion of high-speed digital signal, scheduling and radiation problem. The modeling and simulation of driver, receiver and interconnect is necessary. This dissertation only considers the signal's distortion by interconnect, such as delay, reflection, discontinuity of microstrip, crosstalk and simultaneous switching noise, and so on. Nowadays, there are some simulation software in PCB level, but they are lack of the well ability of modeling. In order to simulate the interconnect accurately, we have to make use of three-dimension full wave analysis method, whose disadvantage is low speed in computing, but is competent for developing rules in high-speed designs.This dissertation brings forward a new method of modeling and simulation on interconnect—FEM-VFM, which combines finite element method with vector fitting method. We can get the Scatter/admittance/Impedance(S/Y/Z) parameter by FEM in frequence domain, gain the equivalent SPICE circuits of interconnect structure by VFM, and extract the circuit's parameters which are used to analyze in time domain. This method lets the simulation not only contain the information of PCB's structure but also have a sustainable computing speed. In this dissertation, author has analyzed several dominating interconnect noises by FEM-VFM, and summarized many ways and means of reducing these noises, which will provide reference with high-speed PCB design of our country.