Abstract
Transmission line (TL) effects are one of the most common causes of noise problems in high-speed DSP systems. When do traces become TLs and how do TLs affect the system performance? A rule-of-thumb is that traces become TLs when the signals on those traces have a rise time (Tr) less than twice the propagation delay (Tp). For example, if a delay from the source to the load is 2 nS, then any of the signals with a rise time less than 4 nS becomes a TL. In this case, termination is required to guarantee minimum overshoots and undershoots caused by reflections. Excessive TL reflections can cause electromagnetic interference and random logic or DSP false triggering. As a result of these effects, the design may fail to get the FCC certification or to fully function under all operating conditions such as at high temperatures or over-voltage conditions.
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References
S. Hall et al., High Speed Digital System Design (John Wiley & Sons, New York, 2000)
Texas Instruments Inc., OMAP5912 Applications Processor Data Manual (2003). http://focus.ti.com/lit/ds/symlink/omap5912.pdf
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Tran, T.T. (2023). Transmission Line (TL) Effects. In: High-Speed System and Analog Input/Output Design . Springer, Cham. https://doi.org/10.1007/978-3-031-04954-5_6
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DOI: https://doi.org/10.1007/978-3-031-04954-5_6
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