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Sigrity technologists guide you step by step on how to use the Sigrity Finite Difference Time Domain (FDTD) simulator to accurately predict the impact of simultaneous switching noise (SSN) in a system context. A PCB layout is directly connected to a system topology without having to perform an S-parameter extraction. This “FDTD-direct” methodology overcomes the challenge faced by SI engineers who fear accuracy could be compromised when converting an S-parameter to a simplified broadband spice model.