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Schematic Editor >
Sources in Nexxim Schematics >
Adding Noise Data to a Nexxim Port Source

Adding Noise Data to a Nexxim Port Source

Current and voltage interface port sources in Nexxim can specify the noise data for the noise analyses. Port power sources do not have the noise data parameter. To specify noise data, click on the button in the row for the noise property on the Parameters tab of the Source Selection dialog for the current or voltage source. The Noise Data List dialog opens:

The default selection is Link to File. To use data from a file of noise data, use the browse button to open the Select File dialog:

Use the Look in field to specify a directory, or locate the file by clicking Use Path, PersonalLib, UserLib, or SysLib. Within the folder, select the file from those listed, or type the name of the file in the File Name box.

• If you select Use path, type the name of the file in the File Name box, or use the Look in field to navigate to the file and record its name. Note that components or libraries imported with Use Path may not be portable when the project is moved to another machine.

• When the In project folder button is selected, references to the file in the design are relative to the directory where the project resides. In this case, the path is saved in the project .adsn file as a variable such as:

.lib '$PROJECTDIR/x_113854.lib'

• The variable $PROJECTDIR will be expanded to the current location of the project when the design is converted to a netlist and run by an analysis tool. Otherwise, an absolute path is saved. If you move a project and its library files together to a new directory, you can preserve the file references by selecting the Project Folder option.

• The frequencies are in Hz and the corresponding noise power spectral densities are in Amp²/Hz.

• To enter the noise data directly, click Enter Frequency/Noise Power Spectral Density points. Enter the frequencies (in Hz) and the corresponding PSDs (in Amp²/Hz). Use the Tab key to advance to the next field.

• When all the noise data are as desired, click OK to close the Noise Data List dialog and return to the Source Selection dialog.

Noise data files have the format:

       #Hz
       freq1 psd1
       freq2 psd2
       .

Note

The PersonalLib (personal library) folder is located at <Project Directory>/PersonalLib; the userlib (user library) folder is located at <Installation Directory>/userlib; and the syslib (system library) folder is located at <Installation Directory>/syslib, where <Project Directory> is the location you specified for your Designer projects, and <Installation Directory> is the directory into which Designer was installed during setup.

SysLib is reserved for libraries supplied with Designer.

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