Spice circuit model for twinaxial cable

A method to generate a complete delay twinaxial Simulation Program with Integrated Circuit Emphasis (SPICE) model, the method comprising:

• generating a reduced delay twinaxial SPICE model, the reduced delay twinaxial SPICE model comprising:
• directly measuring near end S-parameter components and far end S-parameter components of a twinaxial cable, using a vector network analyzer;
• reducing an original time delay of the far-end S-parameter components by multiplying each of the far-end S-parameter components by a complex exponential based on an equivalent delay length, a signal frequency, and an effective dielectric constant, wherein the complex exponential is ejβL, where β=2πf√(∈reff)L/c0, j is the unit imaginary part of a complex number where j2=−1, L is an effective delay length of the twinaxial cable, f is the signal frequency, ∈reff is the effective dielectric constant, and c0 is the speed of light in a vacuum;
• simulating a signal transmitted across a twinaxial cable by running a 4-port SPICE model using the near end S parameter components and the multiplied far end S parameter components;
• recording a magnitude and a phase of the transmitted signal with respect to frequency as outputs of the reduced delay twinaxial SPICE model;
• recovering an original time delay of the far-end S-parameter components using at least two ideal transmission line models;
• blocking incident waves of the transmitted signal using at least two directional junction circuit models;
• and
• comparing a measured magnitude and phase with respect to frequency of the twinaxial cable, to the recorded magnitude and phase with respect to frequency of the reduced delay twinaxial SPICE model.