Signal Integrity Channel Modeling

Build SI channel models by cascading measured S-parameter blocks (nport), lossy frequency-dependent transmission lines (txlineWRLGC, txlineWtable), and lumped parasitic elements (resistor, capacitor, inductor) in RF Toolbox circuit objects. Extract insertion loss, return loss, and crosstalk, then bridge to time-domain analysis via rational fitting.

When to Use

• Building channel models from cascaded nport S-parameter data (connectors, packages, PCB traces)
• Modeling frequency-dependent loss with txlineWRLGC or txlineWtable
• Analyzing differential and multi-port networks with port termination
• Combining lumped parasitics, transmission lines, and measured S-parameter blocks
• Extracting insertion/return loss from mixed lumped-distributed topologies

When NOT to Use

• Loading or plotting S-parameter data -- use matlab-manage-sparameters
• Cascading or de-embedding standalone S-parameter blocks -- use matlab-deembed-rf-cascade
• Composing general-purpose RF circuits (not SI-focused) -- use matlab-compose-rf-circuit
• Fitting rational models or computing TDR -- use matlab-fit-rational-model
• Designing impedance matching networks -- use matlab-design-matching-network