Parametric Analysis over EM Simulated S-parameter Data

Hi Hamid,

It sounds like you want to parameterize the filename for an nport in ADE/OCEAN and use it in parametric analysis.

1. There is Article 11021266 on Cadence Online Support (http://support.cadence.com) that discusses one way to do this using a custom netlist procedure.

2. Article 20040165 on Cadence online support describes a different way to do this.  (Note:  I have not personally tried this method.)

The "VAR" function in IC615/616 does not work for the nport component and there is no easy way to define nport file name as a variable. However you can create a subcircuit around the nport and treat the nport as a primary device. For this primary device, you could define a model with sections for this nport. For each section, you could define a nport with unique file name. When you do simulation, just treat this nport the same as model files and switch to different sections accordingly in either ADE or ADEXL.

++++++++++Example for 2 port s-parameter files: (nport_model.scs)+++++++++++++++++

simulator lang=spectre

library nport_wrapper

section FF

subckt nport_wrapper n1 p1 n2 p2

n1 (n1 p1 n2 p2) nport thermalnoise=yes file="fastfast.sp2"

ends nport_wrapper

endsection FF

section SS

subckt nport_wrapper n1 p1 n2 p2

n1 (n1 p1 n2 p2) nport thermalnoise=yes file="slowslow.sp2"

ends nport_wrapper

endsection SS

section TT

subckt nport_wrapper n1 p1 n2 p2

n1 (n1 p1 n2 p2) nport thermalnoise=yes file="typicaltypical.sp2"

ends nport_wrapper

endsection TT

endlibrary nport_wrapper

best regards,

Tawna

I have successfully used the following workaround to define the nport file name as a variable: Leave the field "S-parameter data file" empty and enter file=filename in the field "Additional parameter list" (under "Rarely used parameters"). Then define a variable named filename; the value of this variable is the path to your S-parameter data file with quotes around it ("..."). Of course, you can also use a different name for the variable, it just has to match the name in the "Additional parameter list".

One other thing that I meant to mention after seeing Tawna's response, and the same for Frank, you can't do a sweep of string values in the ADE L Parametric Analysis tool. You can do it in ADE XL though (either as a global variable, or as a corner).

Regards,

Andrew.

Thanks Frank.

This way, you cannot sweep, can you?

Thanks Andrew.

Would you please elaborate more on how to do it in ADE XL ?

Do you have an example that works with an older version but does not work with the latest version? What versions exactly are you talking about?