Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide Shown below is an example of a project composed of four transmission lines. As in the circuit shown above, the input ports of your project must be numbered 1 through N and the output ports N+1 through 2N. The input of line M should be port M and its output should be port M+N. The software does not check for this condition, but issues a warning message if the number of ports is not an even number. You may generate RLGC parameters automatically by setting up an output file in the project editor. To setup an output file in the project editor, select Analysis ⇒ Output Files from the project editor main menu, then click on the N-coupled Line Model button in the Output Files dialog box which appears. You may also generate an output file of RLGC parameters from previously generated response data in the response viewer. To do so, open your project in the response viewer and select Output ⇒ N-coupled Line Model from the response viewer’s main menu. RLGC parameters are generated for each analysis frequency. 318
Chapter 21 SPICE Model Synthesis Shown below are the RLGC parameters in Spectre format for a two-line project: After the Sonnet header, the format of the RLGC data is provided. This is followed by RLGC data and comments for each analysis frequency. Each comment line begins with the “;” character. Though the comment lines can be ignored, they contain useful modal information. Each value in the comment session has both a real and imaginary part. Characteristic impedance (Z0), propagation constant (γ), and the modal excitation vectors are provided for each mode. Broadband SPICE Model NOTE: The Broadband Spice Extractor feature is only available if you have purchased a Broadband Spice Extractor license from Sonnet. Please see your system administrator if you are unsure of the availability of this feature. In order to create a Spice model which is valid across a broad band, the Sonnet broadband SPICE Extractor feature finds a rational polynomial which “fits” the S- Parameter data. This polynomial is used to generate the equivalent lumped ele- 319
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