Using mtline in a Schematic with AMS Simulator

AMS Designer supports using multiconduction transmission line (mtline) components in your designs.

To prepare an mtline instance for use in a schematic, do the following:

1. In the Virtuoso Schematic Editing window, select the placed mtline symbol in the schematic.
2. Choose Edit - Properties - Objects.
   The Edit Object Properties form appears.
3. Click the Invoke 'LMG' parameter extraction tool button.
   The Transmission Line Model Generator window appears.
4. Enter the parameters needed to characterize the mtline instance.
5. In the Transmission Line Model Generator window, choose File - LRCG file name.
The LRCG File Name form appears.
6. In the LRCG Name field, specify a name for the data file to be created.
7. Click OK.
8. In the Transmission Line Model Generator window, click Calculate Parameters.
The calculated parameters appear in the top of the window.
9. (Optional) Choose Options - Output file Control - RLCG file.
This turns off the generation of a macromodel, which is not used in AMS Designer.
10. Click Create Macromodel.
    The Macromodel Creation notice appears with a message similar to the following:
    Per-unit-length RLCG file is generated and written to the file myw_line.dat
11. Click OK, in the Macromodel Creation notice.
12. (Optional) In the Transmission Line Model Generator window, choose File - Quit.
The window closes.
13. In the Virtuoso Schematic Editing window, select the placed mtline symbol in the schematic.
14. Choose Edit - Properties - Objects.
The Edit Object Properties form appears.
15. In the RLCG data file field, type the full absolute path to the data file that you specified in step 6.
16. Ensure that the use lmg subckt button is not checked.
17. Click OK.

At this point, the mtline instance is ready for netlisting.

Related Topic

• Using mtline in a SPICE or Spectre Subcircuit or Model