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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Envelope Analysis >
   Running Nexxim Envelope Analysis from the Schematic Editor       

Running Nexxim Envelope Analysis from the Schematic Editor

From the Schematic Editor, perform the following steps to set up and run an envelope analysis using Nexxim.

1. Right-click on the Analysis menu in the Project window to open a menu.

2. Select Add Nexxim Solution Setup from the menu, then slide the cursor to select Envelope Analysis from the subordinate menu. The Envelope Analysis dialog box appears.

3. Type an Analysis Name (or accept the default name, for example “Envelope”).

4. For most simulations, leave the Disable box unselected (the default setting). Selecting this box lets you store multiple solution setups for later use. (Note that if a solution setup is disabled before the analysis is run, any changes made to the design will invalidate the simulation results.)

5. The Frequency/Fast Mode panel controls the harmonic balance analysis.

•  Click the Edit Tones/Maxk button to specify the periodic, fast-changing inputs for harmonic balance analysis. On the Edit Tones/Max Harmonic Number dialog, enter the number of inputs in the No. of Tones field. The field changes to reflect the number of frequencies specified. The names of the frequencies are F1, F2, etc. and cannot be changed. Click on the Value field for a frequency to enter the input frequency. Click on the MAXK field for a frequency to enter the desired maximum harmonic number. Click the OK button to close the dialog and return to the Envelope Analysis dialog.

•  When one-tone analysis has been specified, the Method field is activated. Use this field to select HB or shooting (HB is the default). See Handling Strongly Nonlinear Circuits in the HB topic for details on the Method entry.

•  Optionally, use the Auto Refine Solution field to select Yes or No (No is the default). See Increasing Accuracy or Speed in the HB topic for details on the Auto Refine Solution entry.

•  When multi-tone analysis has been specified, the Trim Tolerance field is activated. Use this field to set a tolerance value. See Increasing Accuracy or Speed in the HB topic for details on the Trim Tolerance entry.

•  Optionally, click the Edit button to open the Output dialog. Use the checkboxes on the Output dialog to add net voltages, branch currents, and harmonics to the data generated by the envelope analysis. Click the OK button to add the selected output values and return to the Envelope Analysis dialog.

6. The Time/Slow mode panel controls the transient analysis.

•  Set the Stop field to the stop time for the transient analysis. The Start time is always zero.

•  Optionally, set the Maximum time step field to suggest a maximum transient step size.

•  Optionally, select a transient analysis integration method from the Integration Method pulldown. TRAP (trapezoidal rule) is the default, BDF2 (Gear) is the alternative.

•  Optionally, set the Modulation Bandwidth field to an estimate of the bandwidth of the RF modulation input.

7. Optionally, use the fields in the Solution Option panel to select or add Harmonic Balance analysis options and other Nexxim options to the design. Envelope analysis uses the HB options.

•  Click the Select button on the Name field to open the Select Solution Options dialog.

If any options sets have been defined, their names appear in the Select Solution Options list. To select a previously-defined option set to be used in the current analysis, click the name of the option set, then click OK to return to the Envelope Analysis dialog. The named option set appears in the Name field in the Solution Options panel. See Analysis-Specific Options for details on creating option sets outside of the Solution Setup dialog.

To create a new option set, click New. The Solution Options dialog box appears. Use the Name field to name the new option set. Select the HB Options tab. Make the desired changes to option values, then click OK to return to the Select Solutions dialog box. On the Select Solutions dialog, click the name of the new option settings, then click OK to return to the Envelope Analysis dialog. The name of the new option settings appears in the Name field in the Solution Options panel.

•  Click the Edit button on the Additional field to open a text-entry dialog, Edit additional options.

Use the text box to enter any Nexxim options exactly as they are to appear in the netlist. Do not include the keyword .OPTIONS; the .OPTIONS keyword is automatically inserted at the beginning of the line in the netlist statement.

The line can contain multiple options settings. Use spaces to separate the options settings.

To modify or delete an option once it has been added, just edit or delete its entry in the list.

To clear all options, delete the entire line.

Click OK to return to the Envelope Analysis dialog.

The options in the Additional field are automatically added to the netlist when the solution containing them is performed.

•  For more information, see Nexxim Envelope Analysis Options.

8. Run the simulation:

•  On the Circuit menu, click Analyze. If the circuit is set up correctly, the analysis begins immediately and a red progress bar appears.

•  If the analysis is not successful, check the Message Window for an explanation, and then take corrective action.

•  For details on creating and modifying reports, see Generating Reports and Postprocessing.

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