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How to Model 40cm tline Using LMG Tool

I want to model a 40cm FR4 line in Cadence using the parameters provided by manufacturer. I modelled a 4cm line using mtline model and LMG tool in it. A parameter of fmax is set to 18GHz as I have to operate at 16GHz.

When I tried to model a 20cm TLine, I received error message that, the tool cannot model lines with more than 5 wavelengths long.

Could somebody tell me how to model a 40cm transmission line in Cadence using given parameters? Which tool does this sort of modelling?

Thanks in advance.

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Tawna over 14 years ago

Hi Saurabhsant,
Do not use LMG . It is no longer supported and hasn't been updated (fixes, enhancements) in a number of years. If mtline isn't working, you may need to look at the nport. Please see the following Cadence On Line support solutions:

The mtline appNote:
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:doc;src=wp;q=ApplicationNotes/Custom_IC_Design/mtlineAN.pdf
Nport appNote:
http://support.cadence.com/wps/PA_DocumentViewer/solution/11112746/NportAppNote72_8Jan.pdf

If you are using mtline with significant skin effect and dielectric loss at high frequency, you will need to use the workaround in Cadence On-line Solution 11684156.

http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11684156

Otherwise you may get incorrect results.
fmax (nport or mtline) needs to be set to the highest frequency of interest (this includes harmonics. I suspect you need to set this higher.
best regards,
Tawna
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Tawna over 14 years ago

Hi Saurabhsant,
Do not use LMG . It is no longer supported and hasn't been updated (fixes, enhancements) in a number of years. If mtline isn't working, you may need to look at the nport. Please see the following Cadence On Line support solutions:

The mtline appNote:
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:doc;src=wp;q=ApplicationNotes/Custom_IC_Design/mtlineAN.pdf
Nport appNote:
http://support.cadence.com/wps/PA_DocumentViewer/solution/11112746/NportAppNote72_8Jan.pdf

If you are using mtline with significant skin effect and dielectric loss at high frequency, you will need to use the workaround in Cadence On-line Solution 11684156.

http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11684156

Otherwise you may get incorrect results.
fmax (nport or mtline) needs to be set to the highest frequency of interest (this includes harmonics. I suspect you need to set this higher.
best regards,
Tawna
Cancel
Vote Up 0 Vote Down

Cancel

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