Simulation and Application of Signal Integrity and Power Integrity in High-Speed Digital Circuit
|Course||Communication and Information System|
|Keywords||High-speed digital circuit Signal integrity Characteristic impedance Powerintegrity Simultaneous switching noise|
With the increase of system frequency and chip’s edge rate in high-speed digital circuit, the electronic circuit system has fully entered the area of high-speed and high-frequency in1GHz. The signal integrity and power integrity have become one of the major ingredients about system performance. They also have become two unavoidable problems when designer designing the PCB. This paper focuses on elaborating the main factors of the impact of signal integrity and power integrity in high-speed digital and how to solve signal integrity and power integrity problems.Firstly, the paper elaborates the basic concepts of signal integrity and power integrity, and summarizes the current research status and results.Secondly, based on analyzing the transmission line theory, this paper deeply discusses the signal integrity problems affecting high-speed digital circuit design, including reflection, and crosstalk. The generation mechanism of the reflection and crosstalk problems are discussed. The termination methods for improving reflection are simulated; the factors affecting crosstalk are simulated and analyzed.Thirdly, the main factors that cause power integrity issues discussed. Based on studying the origins of simultaneous switching noise, some methods for improving power integrity are presented and the selection and location of decoupling capacitor is simulated.Finally, based on the modern high-speed digital circuit design method, the Gigabit Ethernet switch have be designed and some methods are presented about effectively suppressing simultaneous switching noise and high-speed signal crosstalk. These are helpful for guiding high-speed digital circuit design.