Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> Upon the completion of creating your Broadband model, you should open the original project in the response viewer, then add the predicted S-parameter data file to your graph and compare the two responses. If you are creating your Broadband Model in the response viewer, you may do this automatically by clicking on the Plot button in the Broadband Spice Details dialog box which appears upon completion of your model. Use the log information in the Details window, which is detailed in the next section, to determine which parameter had the highest error and any critical parameters whose error was greater than 0.1%. Check these parameters to see how much the curve fit data varies from your circuit response. If your Broadband Spice Model is to be used for a transient analysis, be aware that the frequency response of the model up to 1/T where T is the minimum time step of the transient analysis is important. You should use the Advanced Broadband Model options dialog box to specify additional predicted data up to 1/T. You access this dialog box by clicking on the Advanced button in the Broadband Model File entry dialog box in the project editor or in the Output Broadband Model dialog box in the response viewer. This allows you to view the frequency response of your model at data points not included in your em analysis. You should look for anomalies in the response that indicate a problem with the model, such as S-parameters greater than one or unexpected sharp resonances. You may also use the stability factor in order to ensure a stable transient analysis. Please see "Broadband Spice Extractor Stability Factor" on page 327. 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. Broadband Spice Extractor Log The Broadband Spice Extractor log, displayed in the Broadband Spice details window, contains detailed information about the creation of your Spice model file. You may view a summary of the log or the complete log. To view the summary of the log, click on the Summary button at the bottom of the window. To return to the full log, click on the Complete button. You use the log to determine which parameters to examine in order to determine if the Spice model is accurate enough for your use. Two log files are shown below, the first log is for a model which achieved the error threshold and the second log 324
Chapter 21 SPICE Model Synthesis is one in which the error threshold was not achieved on all the parameters. A warning message is issued for all S-parameters whose error is greater than the error threshold. Generating files coup_end.lib and coup_end_predict.snp. --Model Log for coup_end-- Data set has 201 points and 4 ports --Model Options-- Error threshold(%) = 0.5 Error Threshold Output predicted file: C:\Program Files\sonnet\project\coup_end_predict.snp Max order target: 200 --Model Results-- S11 Order = 2 Error(%) = 0.03850722 S12 Order = 2 Error(%) = 0.005954352 S13 Order = 2 Error(%) = 0.005379771 S14 Order = 2 Error(%) = 0.02510101 S22 Order = 2 Error(%) = 0.001637623 S23 Order = 2 Error(%) = 0.001033019 S24 Order = 2 Error(%) = 0.005380005 S33 Order = 2 Error(%) = 0.001635971 S34 Order = 2 Error(%) = 0.005951772 S44 Order = 2 Error(%) = 0.03853657 --Model Summary for coup_end-- Maximum error was for S44, Error(%) = 0.0385366 Total model time: 0.391 seconds Model coup_end successful Curve Fit Data File Maximum Order Error values for S-parameters S-parameter with greatest error Indicates that the Error Threshold was achieved for all S-parameters 325
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