The Research On Suppression Technology Of The Simultaneous Switching Noise In Airborne Complex PCB

With PCB(the Printed Circuit Board) of avionics equipment for modern civil aviation aircraft is getting more and more complicated, high edge rate of rise, fast clock frequency and low voltage in circuit system makes the Simultaneous Switching Noise(SSN) is becoming more and more serious. As a result,electromagnetic interference will affect the reliability and safety of aircraft.How to effectively suppress Simultaneous Switching Noise means significance for improving comprehensive properties and safty of aviation electronic equipment.Electromagnetic Band Gap(EBG) structure,as a method of suppressing Simultaneous Switching Noise, can prohibit the spread of electromagnetic waves in a specific frequency range. As a effective way of suppressing Simultaneous Switching Noise, EBG has the advantages of easy modeling, low manufacturing costs, small volume of space, and has very broad application prospects.This paper mainly studies relative issues about Simultaneous Switching Noise(SSN) and Electromagnetic Band Gap, researches formation mechanism and common supression technology,analyzes suppression properties of various classical planar Electromagnetic Band Gap structure,optimizes layout of L-bridged EBG structure and designs a novel planar Electromagnetic Band Gap structure for SSN suppression.Given affect of transmission quality of electronic signal on WS-EBG, this paper furtherly conducts signal integrity test on PCB with WS-EBG. Experimental results show that PCB with WS-EBG can maintains good Signal Integrity(SI)while using differential signal line pair as a transmission lines.