Study Of Signal Integrity And Power Integrity In High Speed Digital Circuits

Frequency of modern electronic system design has reached GHz and above. The corresponding rising / falling edge go to ps magnitude. The continuous improvement of integration increases the density of interconnects. All of these bring a lot of signal integrity and power integrity issues.This paper introduces the main noise such as reflection, crosstalk and simultaneous switching noise of signal integrity and power integrity. Several termination methods have been listed that are solutions to the reflection, and show different strengths and weaknesses of those methods. The same chapter presents the basic concepts and characteristics of the crosstalk reduction. The article also mentions several ways how to reduce the effect.The focus is analysis of simultaneous switching noise and the measures to suppress it. From impedance angle, adding capacitance decreases the simultaneous switching noise on the circuit. Power / ground plane pair similar to capacitors. It also made changes in the thickness and dielectric constant to try to reduce the simultaneous switching noise, which gets better results.The return current of ideal differential lines is equal and opposite, so no current flows and no simultaneous switching noise. However, this can not be considered at high frequencies. This paper establishes a differential line circuit model. Time-domain analysis of power/ground resonance was executed, which was caused by return current of differential pair. After that, using mixed-mode S-parameters analyzes the interaction between the differential lines and the power plane structure. These conclusions have some guidance for wiring.