Community Forums Custom IC Design nonlinear capacitor and nonlinear current source

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nonlinear capacitor and nonlinear current source

scc243

Hello,

I am trying to model a nonlinear amplifier. I have a relative model in mind but I need to somehow plug in the nonlinear equation for current and the nonlinear capacitors.

I have seen in the forum, a good way to do this is using bsource in analog lib. for some reason, I do not see a bsource in my analog lib?

Another suggestion I have heard is to write this using an OCEAN script. How would I go about doing this?

Very new to cadence virtuoso. Apologies for trivial questions.

  • Dear scc243,

    scc243 said:
    I have seen in the forum, a good way to do this is using bsource in analog lib. for some reason, I do not see a bsource in my analog lib?

    From the Cadence article at URL:

    support.cadence.com/.../ArticleAttachmentPortal

    It includes the following:

    "Note: Starting in IC6.1.7-64b.500.6, bsource has been added as a component in the analogLib library. "

    I did not see the version of IC tools you are using in your Forum post. You might verify that your version is at least IC6.1.7-64b.500.6.

    You might also type at the UNIX terminal

    spectre -h bsource

    to see if the component is listed in the help manual for your version of spectre.

    scc243 said:
    Another suggestion I have heard is to write this using an OCEAN script. How would I go about doing this?

    Since I assume your nonlinear capacitors are varying with the voltage across them at each time point of the simulation, in my opinion, an ocean script is really not an appropriate nor efficient means to model a nonlinear capacitor in the time domain. A custom verilog-A based model is a possible option for a non-linear component - which is also a behavioral model.

    Shawn

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