Rational Fitting and Time-Domain Analysis

Fit S-parameter data to rational function models using the rational object, then compute time-domain responses (TDR, impulse, step) and export to SPICE/Verilog-A.

When to Use

• Fitting S-parameter data to rational function models (vector fitting, AAA)
• Computing time-domain responses: TDR, impulse, step, arbitrary waveform
• Exporting broadband circuit models to SPICE or Verilog-A
• Verifying fit accuracy in frequency domain with freqresp
• Enforcing causality or passivity on fitted models
• Extracting poles, zeros, and state-space matrices from fits

When NOT to Use

• Loading or plotting S-parameter data -- use matlab-manage-sparameters
• Converting between network parameter types -- use matlab-convert-network-parameters
• RF budget or cascade analysis -- use matlab-analyze-rf-budget or matlab-deembed-rf-cascade