Analysis And Improve High-speed Signal Integrity In Notebook Computer

With the continuous development of electronic design level, the frequencies of the signals are faster and faster, PCB boards become more and more compact, smaller and smaller, signal integrity becomes a more and more prominent phenomenon, and it has become a new hot spot for research.Development of notebook computers is faster and faster, it's now reflected in the following areas: the system clock frequencies are increasing; notebook computer is more integrated; performance getting better and better; development time shorter. All this prompted us to notebook PCB design process, full account of signal integrity problems, the use of proper design to ensure proper signal transmission as the key to successful design is one of the technologies.This paper introduces the definition of high-speed signal, definition the theory of signal integrity, the importance of high speed signal integrity; analyze the mechanism of the factors that affect the signal integrity from the reflection, crosstalk, simultaneous switching noise and other issues.Then in the basis of theoretical analysis, extended to the design of high-speed laptop computers that we need to pay attention to signal integrity problems introduced gradually in three phases: preliminary design preparation stage, the middle of the layout of the stage, the final PCB layout phase. In the PCB design of laptop computer, signal integrity issues fully into account and solve the problem of signal crosstalk is the key to the success of a design.In the design process, the crosstalk problem is simply to rely on the experience of engineers to determine, there is no perfect solution to fast, in order to solve this problem, this paper used innovative application SKILL language programming, applied to the Cadence Allegro layout software, by running the program, engineers can quickly and accurately find the place where the crosstalk is, modify layout based on the results of this software, greatly improving efficiency. A SKILL program is compiled to solve the crosstalk problem of laptop high speed HDMI signals, get the specific experimental data and graphical analysis to verify the signal integrity, and ultimately to the integrity of the signal.