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Mutual Coupling

Omar Alngar

Dear All,

I want to build a transformer.

I use "mind" tool from analoglib Library to assign a mutual coupling between two ideal spiral inductors in schematic.

However, it fails with other technology's Inductors.

I can not use this tool in both schematic and Layout design, is there any solution to build my own transformer in schmeatic and layout as well.

or should I build and simulate it using another EM-simulator and import it in my schematic as (Two-Port) s-parameter file?

Thanks in advance.

  • ShawnLogan

    Dear Omar,

    I am afraid I do not understand your comment:

    Omar Alngar said:
    However, it fails with other technology's Inductors.

    Are you suggesting you are unable to schematically add mutual coupling between two distinct inductors (i.e., not instances of an "mind" from the analogLib) placed on a schematic?

    Certainly, you cannot layout an "mind" component from the analogLib library as there is not a unique relationship between its performance and its physical geometry. Typically, the layout of an inductive based element is created with its model based on its layout in an EM simulator that can simulate its characteristics. From that an S-parameter or SPICE model can be created and used in a Cadence schematic simulation.

    You might also consider creating a verilogA model of an inductive based component. There is a paper detailing such a methodology with Ken Kundert as one of its authors at URL:

    designers-guide.org/.../mag.pdf

    Shawn

  • Omar Alngar
    in reply to ShawnLogan

    "Are you suggesting you are unable to schematically add mutual coupling between two distinct inductors (i.e., not instances of an "mind" from the analogLib) placed on a schematic?"

    That is right?

    Is there any solution for this problem, or as you mentioned that using S-Parameter , imported from EM-simulator, is the best solution for that problem?

  • ShawnLogan
    in reply to Omar Alngar

    Dear Omar,

    Omar Alngar said:
    Is there any solution for this problem, or as you mentioned that using S-Parameter , imported from EM-simulator, is the best solution for that problem?

    You can certainly create a circuit model using ideal elements from the analogLib to attempt to model the coupling between two distinct inductors. As I mentioned previously, you can also create a veriloga model that can model mutual inductive coupling.

    However, I personally am not aware of "component" means to include inductive coupling between two discrete inductors placed in a schematic.

    Shawn

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