# Termination Placement in PCB Design How Much Does it Matter?

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1 How Much Does it Matter? By Doug Brooks Termination Placement How Much Does It Matter? Technical Paper Series Presented by

3 Figure 1. Ideal placement of parallel termination resistor and the simulated results If we place the terminating resistor one inch in front of the receiver, that means there is an unterminated transmission line segment between the terminating resistor and the receiver. The simulation for this, and its result, are shown in Figures 2a and 2b. There are some pretty healthy spikes that result from this placement. Figure 2 Parallel termination placed in front of the receiver. Note the worsening simulated results. A better solution is simple but the implications are not always recognized by designers. Instead of placing the termination resistor before the receiver, place it after the receiver. Seems simple, doesn t it? The difference is that now there is a terminated transmission line segment between the device and the termination. Before, there was an un-terminated segment, now there is none. Figures 3a and b show this simulation and its result. The results are virtually identical to Figures 1a and b. Copyright 2002 by UltraCAD Design, Inc. and Mentor Graphics Corporation 3

4 Figure 3 Parallel terminating resistor placed past the receiver. Note that the simulated results are virtually identical to the ideal case (Figure 1) The simple act of placing the termination after the receiver instead of before the receiver makes all the difference in the world. Series Termination: We can perform the same types of simulations with series termination strategies. The results may be surprising. They are shown in Figures 4a and b, for the terminating resistor placed right at the driver, and Figures 5a and b where the series resistor is placed about an inch away. The simulation results are very similar. Figure 4 Series termination resistor placed right at the driver and the simulated results. It turns out that the placement of series termination resistors is not as critical as parallel placement terminations. This is, in part, because we are already dealing with a full reflection from the far side of the trace, and even if the placement is not perfect, we are dissipating most of the energy in the reflection at the driver before it can propagate back down the trace a second time. Copyright 2002 by UltraCAD Design, Inc. and Mentor Graphics Corporation 4

5 Figure 5 Series terminated resistor placed some distance past the driver and the simulated results. While the simulated results are slightly worse, the difference is not very great Summary: It makes a difference where we place termination resistors along our transmission lines. But series terminated circuits are much less affected by placement compromises than parallel terminated circuits are. Footnote: 1 Transmission Line Terminations, It s the End That Counts! available from Mentor s web site at Copyright 2002 by UltraCAD Design, Inc. and Mentor Graphics Corporation 5

6 About the author: Douglas Brooks has a B.S and an M.S in Electrical Engineering from Stanford University and a PhD from the University of Washington. During his career he has held positions in engineering, marketing, and general management with such companies as Hughes Aircraft, Texas Instruments and ELDEC. Brooks has owned his own manufacturing company, and he formed UltraCAD Design Inc. in UltraCAD is a service bureau in Bellevue, WA, that specializes in large, complex, high density, high-speed designs, primarily in the video and data processing industries. Brooks has written numerous articles through the years, including articles and a column for Printed Circuit Design magazine, and has been a frequent seminar leader at PCB Design Conferences. His primary objective in his speaking and writing has been to make complex issues easily understandable to those individuals without a technical background. You can visit his web page at and him at High-Speed PCB Design Tools Mentor Graphics high-speed tools integrate the simulation power of ICX and XTK, the system-level timing capabilities of Tau, the constraint management and solution-space exploration of eplanner, and the ease-of-use you ve come to expect from HyperLynx. Regardless of your design environment, Mentor Graphics has a high-speed design package specifically tailored to your needs. Copyright 2002 by UltraCAD Design, Inc. and Mentor Graphics Corporation 6

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