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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Design Examples >
Nexxim RF Design Examples >
   Transient Analysis Method Option RF >
       Use the NDF2 Method Option for Transient Analysis           

Use the NDF2 Method Option for Transient Analysis

For cases where the exact circuit behavior is important, Nexxim offers an integration method, NDF2, that avoids numerical ringing. Here is how to select the Method=NDF2 option to Transient Analysis.

1. Expand the Analysis icon on the Project tree, and double-click the Transient analysis setup.

2. The Transient Analysis dialog reopens.

3. We want to perform the same transient analysis, so the Step and Stop values should be set up the same as before.

4. Click the Select button in the Solution Option panel:

5. The Select Solution Options window opens:

6. Click New. The Solution Options box opens, with the Transient Options tab already selected.

7. The default Integration method is trapezoidal. From the pulldown in the Integration method window, select ndf2 as shown in the picture above (for more information see Transient Analysis Options). Click OK on the Solution Options window.

8. The Select Solution Options window reappears:

9. Click the name of the new set of options you just defined (Nexxim Options in our example). Click OK.

10. The Transient Analysis setup window reappears, now showing the name of the new option (“Nexxim Options” in our example) set in the Solution Option panel:

11. Click OK.

12. To run the modified transient analysis, open the Analysis icons, right-click the solution setup “Transient” you just created, and select Analyze. This will run the analysis with the options you have set up.

A progress window briefly appears at the lower right to indicate that the transient analysis is being performed. When the analysis is completed, the Message Manager window at the lower left shows the name of the project, errors or warnings if any, and analysis statistics such as CPU time.

13. The transient analysis report is redrawn with the new result:

The simulation response using NDF2 does not exhibit the numerical ringing that we saw with the trapezoidal rule.

For more information, see Nexxim Transient Analysis.

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