An Effective Mitigation Method on the Signal-Integrity Effects by Splitting of a Return Current Plane

귀환 전류 평면의 분할에 기인하는 신호 무결성의 효과적인 대책 방법

  • Jung, Ki-Bum (Korea Radio Promotion Association, EMC Center) ;
  • Jun, Chang-Han (Korea Radio Promotion Association, EMC Center) ;
  • Chung, Yeon-Choon (Department of Information & Communication Engineering, Seokyeong University)
  • 정기범 (한국전파진흥협회 EMC기술지원센터) ;
  • 전창한 (한국전파진흥협회 EMC기술지원센터) ;
  • 정연춘 (서경대학교 정보통신공학과)
  • Published : 2008.03.31


Generally a return current plane(RCP) of high speed digital and analog part is partitioned. This is achieved in order to decrease the noise interference between subsystem in PCBs(Printed Circuit Boards). However, when the connected signal line exists between each sub system, this partition will cause unwanted effects. In a circuital point of view, RCP partition has a bad influence upon signal integrity. In a EMI(Electromagnetic Interference) point of view, the partition of the return current plane becomes a primary factor to increase the radiated emission. Component bridge(CB) is usecl for the way of maintaining signal integrity, still specific user's guide doesn't give sufficient principle. In a view point of signal integrity, design principle of multi-CB using method will be analyzed by measurement and simulation. And design principle of noise mitigation will be provided. Generally interval of CB is ${\lambda}/20$ ferrite bead. In this study. When multi-CB connection is applied, design principle of ferrite bead and chip resistor is proved by measurement and simulation. Multi-connected chip resistance$(0{\Omega})$ is proved to be more effective design method in the point of signal integrity.


Return Curent Plane(RCP);Signal Integrity;EMI;Component Bridge(CB);PCB


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