Exporting Momentum Data

Momentum data can be exported to a 3D EM modeling tool and to IC-CAP for additional analysis. The method you use to export data depends on the target application.

Exporting Momentum Data to IC-CAP

Momentum can write S-parameter output files in the IC-CAP Measured Data Management (MDM) File Format. These ASCII data files can easily be read and used for modeling purposes in IC-CAP 5.x.

Enabling the IC-CAP MDM File Output

The IC-CAP MDM files are not created by default. You must create or edit the Momentum configuration file:

($HOME)/hpeesof/config/momentum.cfg

and add the line:

MOM3D_GENERATE_MDMFILE = TRUE

If this variable is set, you will find the IC-CAP MDM file once the Momentum simulation is complete:

(current_ADS_project_name)/mom_dsn/(current_layout_name)/proj.mdm

This file will only be available for 1-port and 2-port structures.

The data is densely sampled (as a function of frequency) if the adaptive simulation mode was used during the Momentum simulation, otherwise, only the requested sample points appear in the proj.mdm file.

Disabling the IC-CAP MDM File Output

If you do not want output in an .mdm file, you must disable the MOM_GENERATE_MDMFILE variable.

You must set:

MOM3D_GENERATE_MDMFILE = FALSE

or remove that line in the Momentum configuration file:

($HOME)/hpeesof/config/momentum.cfg

Example

This is an example of the contents of an .mdm file that was created from a Momentum simulation.

! VERSION = 6.00
BEGIN_HEADER

ICCAP_INPUTS

freq F LIST 1 16   0.000000e+00 1.000000e+07 5.008333e+09 8.965347e+09
     1.000667e+10 1.667111e+10 2.666778e+10 3.000000e+10

ICCAP_OUTPUTS
s S B C GROUND
END_HEADER

BEGIN_DB
#freq R:s(1,1) I:s(1,1) R:s(1,2) I:s(1,2) R:s(2,1) I:s(2,1) R:s(2,2) I:s(2,2)

0.000000e+00   0.00000   0.00000   1.00000   0.00000   1.00000   0.00000   0.00000  0.00000
1.000000e+07   0.00000 -0.00139   0.99999 -0.00238   0.99999 -0.00238   0.00000  -0.00139
5.008333e+09 -0.57309 -0.24306   0.30188 -0.71430   0.30188 -0.71430 -0.57309  -0.24306
8.965347e+09 -0.59290 -0.28893 -0.38554   0.39683 -0.38554   0.39683 -0.59291  -0.28893
1.000667e+10 -0.85726   0.47812 -0.00500 -0.00983 -0.00500 -0.00983 -0.85726  0.47812
1.667111e+10   0.38444   0.32013   0.52995 -0.65935   0.52995 -0.65935   0.38444  0.32013
2.666778e+10 -0.44899 -0.19974 -0.39885   0.68719 -0.39885   0.68719 -0.44899 -0.19974
3.000000e+10   0.03191   0.96691 -0.01394 -0.00395 -0.01394 -0.00395   0.03191  0.96691

 END_DB

Exporting Momentum Data for 3D EM simulation

You can export Momentum data for 3D EM simulation without running a Momentum simulation first. A complete set of files that describe the design geometry and Momentum setup, including the technology and stimulus information, can be written to a special directory by using a menu command in the ADS Layout window.

To generate files and for use in 3D EM simulation:

In the ADS Layout window, choose Momentum > 3D EM > Save Files for 3D EM .
The files are then generated and saved in the current project under <project_name> /mom_dsn/ <design_name> /3DEM. They contain both the design geometry and Momentum setup.

For more information on how to import Momentum files into your 3D EM modeling tool, refer to the documentation supplied with the tool, or check with the tools manufacturer.

Exporting the Momentum Substrate to RFDE

Do the following to export the momentum substrate for use in RFDE:

Define the substrate.
Perform a Momentum Simulation (e.g., Momentum > Substrate > Precompute... ).
Save the project.

In RFDE, select the proj.tch file located under <projectDir>/ mom_dsn /<designName>.
If the mask numbers in RFDE and ADS do NOT match, edit the proj.tch file and replace the ADS mask numbers with the ones found in RFDE.

Note
You can access the proj.tch file from the temporary simulation directory before the simulation is finished. The location of the temporary simulation directory depends on the operation system settings. Generally, for UNIX and Linux, it is found under /var/tmp/<somedirectory>. On the PC it depends on the value of the TEMP system environment variable.