Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> 4 Select Output ⇒ PI Model File from the response viewer main menu. The Output PI Model dialog box appears on your display. The contents of the output window in the Output PI Model dialog box displays the Spice data for the PI Model in the PSpice format which is the default. 5 Select the desired file format from the Format drop list. If you select Spectre as the Format (PSpice is the default), the contents of the output window is updated. 6 To change the parameters for the SPICE data, click on the Model Options button. The PI Model Options dialog box appears on your display. To reduce the number of lumped elements in the model, open circuit limits can be specified here as shown below. The values are defined as follows: RMAX: Maximum allowed resistance (ohms). The default value is 1000.0 ohms. 314
Chapter 21 SPICE Model Synthesis CMIN: Minimum allowed capacitance (pF). The default value is 0.01 pF. LMAX: Maximum allowed inductance (nH). The default value is 100.0 nH. KMIN: Minimum allowed mutual inductance (dimensionless ratio). The default value is 0.01. RZERO: Resistor to go in series with all lossless inductors (resistance in ohms). Needed for some versions of SPICE. The default value is 0.0 Separation: This is the calculation interval between the two frequencies used to generate the SPICE model specified as a percentage. The second frequency is obtained by adding the specified percentage of the first frequency to the second frequency. All calculated component values which fall outside the allowed range specified by the user in the model options are excluded from the resulting lumped model. The RZERO entry is provided for those versions of SPICE which need inductors to have some small loss to avoid numerical difficulties. The default value of 0.0 disables this capability. Enter the desired values for the parameters in the PI Model Options dialog box. 7 Click on the OK button in the PI Model Options dialog box to apply the changes and close the dialog box. 8 Click on the Save button in the Output PI Model dialog box. A browse window appears which allows you to save the data displayed in the output window. The file extension depends on which type of SPICE format you have selected. A Simple Microwave Example Shown below is the Ste_sym example, a simple step discontinuity followed by the PI model produced when you set up an optional PI Model Spice output file. 315
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