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Simulation with bbspice file or spectre file created from touchstone/citi file

amitG22

Hi Community,

Am I mistaken if I assume that Virtuoso doesn't allow you to directly use a already present bbspice file in the simulation? 

I know that a rfm file is accepted, we just need to choose "rfm" as the data format in the nport form. Is there no possibility to directly use a bbspice file in this way? 

Before you ask why I am not letting cadence generate the bbspice file for me, let me answer that question. The conversion seems to take really long when done in spectre. With ADS it is generated really fast.

Another question related to this, is the S-parameter data format "spectre" not supported as well? I can generate both a bbspice and a spectre file in ADS from an existing citifile. Can I not use this spectre file directly with the nport? At least the possibility seems to be present. But when I tried to do that, I am getting the following error.



The scs file looks ok to me. Here is a snippet : 


Any suggestions on what is going wrong here?

Regards,

Amit

Parents

  • Amit,

    The spectre format for s-parameter files is just an alternative format to Touchstone. It's still in terms of real/imaginary or phase/magnitude for the matrices of s-parameters at each frequency; it does not just mean you can use a spectre sub circuit instance.

    You could use RFM if coming from an external rational model creation tool such as ADS broadband spice, or if including a spectre subckt model as you have here, that can't be done with an n-port. You need to create a component which has the right pins and netlists in the right order - maybe the Keysight integration can take care of that (that's a question for Keysight, not us).

    Regards,

    Andrew

  • in reply to Andrew Beckett

    I would also suggest that you contact customer support about using the built-in bbspice. First of all, make sure you're using a current version of Spectre, and take a look at Tawna's 7 Habits of Highly Successful S-Parameters application note. If you're still seeing performance issues with the translation, then we'd welcome you to contact support so that we can investigate further.

    Andrew

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