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34 The PCB Design Magazine • October 2017 answer NOW!" is probably good enough to make an engineering decision. Summary By using the Cannonball-Huray model, with copper foil roughness and dielectric material properties obtained solely from manufactur- ers' data sheets, a practical method of modeling high-speed channels is now achievable using commercial field-solving software employing Huray model. If you need an OK answer now instead of a PRACTICAL MODELING OF HIGH-SPEED BACKPLANE CHANNELS Figure 8: Simulated differential insertion loss (SDD21) shown on left and differential TDR (TDD11) shown on right. Figure 9: Channel simulation at 28 GB/s. Total length = 20.25".

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