matlab-fit-rational-model

What problem does it solve?

This Skill enables you to convert frequency-domain S-parameter measurements into rational models and then derive physically meaningful time-domain responses for verification, simulation, and export.

Core Features & Use Cases

• Rational model fitting for RF networks: Fit S-parameter data using the rational object to create broadband, compact mathematical representations.
• Time-domain analysis from fitted models: Compute TDR, impulse, step, and arbitrary transient responses derived from the rational fit.
• Model verification and physical constraints: Validate fit accuracy in the frequency domain and enforce causality/passivity before downstream use.
• Export for simulation ecosystems: Generate SPICE subcircuits or Verilog-A models from the fitted rational representation.

Quick Start

Fit the attached S-parameter file default.s2p with rational, verify the S21 fit against the original data, and plot the time-domain step response in nanoseconds.