Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> 6 Enter the desired name for the Spice model file in the Model File text entry box. A default filename is provided which places the Broadband Spice model file in the same directory as your source project. If you have selected multiple parameter combinations, a file is produced for each combination. If you wish to use another name or save the file in another location you may edit the text entry box. 7 Enter the desired error threshold. The lower the error threshold you set, the more processing time is required to calculate the model. The error threshold is the error present between the source data and the fitted curve and is defined as follows: Error = N ⎛ ⎞ ⎜ sf () Source – sf () ⎟ ⎜∑ Fit ⎟ ⎝ f = 1 ⎠ ----------------------------------------------------------------- ⋅ 100 N where f = the number of the frequency point N = the total number of frequency points s(f) Source = the value of the S-parameter at the frequency point f in the project source response s(f) Fit = the value of the S-parameter at the frequency point f in the fit curve data The calculation of the Broadband Spice model stops when this error threshold is reached or when it proves impossible to improve the error. We recommend using the default value of 0.5% initially and not setting the threshold below 0.1%. 8 Select the Generate Predicted S-Parameter data file if it is not already selected. This option is selected by default. When this option is selected, the Predicted S- Parameter data upon which the model is based is also output to a file. The name of the file appears below the checkbox and may not be changed. The file is created in the same directory in which your model file is created. Once the creation of the model is completed, you may use the response viewer to compare your original response data to the Predicted S-Parameter data to evaluate the accuracy of the Broadband model. 322
Chapter 21 SPICE Model Synthesis 9 Click on the Create button to create the Broadband Spice model. A progress window appears on your display. Be aware that the processing time needed to create your models can be significant. The processing time is proportional to the number of analysis frequencies times the square of the number of ports in your circuit. If you wish to stop the process before it is complete, click on the Cancel button in the progress window. 10 Once the calculation is complete, the Broadband Spice details dialog box appears on your display. A log of the creation process appears in this dialog box. The log contains information on the error for each parameter, which parameter had the greatest error, and the filename of the predicted S-Parameter data. It will also indicate whether the model achieved the error threshold. Use this information to determine which parameters to examine in the response viewer. You should look at the S- parameter with the greatest error as well as any critical S-parameters whose error was greater than 0.1%. For a detailed explanation of the log, see “Broadband Spice Extractor Log,” page 324. 11 Click on the Plot button to open a plot of your response data versus the predicted S-Parameter data. The Predicted S-Parameter data is opened in the response viewer along with the original response data. You should view the S-parameter with the greatest error and any other critical response data whose error was greater than 0.1% to judge if the ''fit'' or accuracy of the model is sufficient for your needs. If the model is not accurate enough, see “Improving the Accuracy of the Broadband Spice Model,” page 326 for suggestions on improving your Broadband Spice model. Checking the Accuracy of the Broadband Spice Model It is possible to save the predicted S-parameter data created while calculating your Broadband Spice model so that you may visually check the accuracy of your model when it is complete. To save the predicted S-parameter data, you should select the Generate Predicted S-Parameter data file checkbox in the Output Broadband Model File dialog box when you create your model. The predicted S-parameter data file is created in the same directory as your Broadband Spice model file. 323
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