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Reduction of signal line to power plane coupling using controlled-return- current transmission lines

: Engin, A.E.; Ndip, I.

IMAPS 2009, 42nd International Symposium on Microelectronics : Bringing Together The Entire Microelectronics Supply Chain! November 1-5, 2009 San Jose Convention Center - San Jose, California, USA
San Jose, Calif., 2009
ISBN: 0-930815-89-0
International Symposium on Microelectronics <42, 2009, San Jose/Calif.>
Conference Paper
Fraunhofer IZM ()

In printed circuit boards, transmission of high-speed digital signals is achieved using single-ended or differential transmission lines, typically using a microstrip or stripline configuration. This requires continuous reference planes, which is difficult to maintain in multilayered IC packages or boards. As a result, the signal return current may need to flow between different reference planes due to a cut-out in the reference plane or a signal via transition. The uncontrolled path of the return current results in signal integrity and electromagnetic interference problems. We propose a new controlled-return-current transmission line design to reduce this problem. Our approach is based on guard traces to help control the return currents.