Dear acharlet, [quote userid="515774" url="~/cadence_technology_forums/f/custom-ic-design/49032/spicein-how-to-import-mutual-inductance-k/1377308#1377308"]At the end, I found on Cadence Support in the Assura and Cdl section that mutual inductor are not supported. They cannot be imported with SpiceIn.[/quote] Thank you for your update! I did see the URL to the Assura article, but from your description of the problem, I thought you were using SPICEIN to import a SPICE file with a mutual inductor into a Virtuoso schematic. Hence, I am not sure why you need to rely on Assura for a SPICE netlist import only - this may be my ignorance though! From my understanding Assura is only used for CDL import not a SPICE file import. In any case, perhaps you can take an alternate approach and create a model for your mutual inductor that uses only simple, non-mutual inductors in your SPICE netlist for import. This can be done in a couple of ways. One way is to include a current controlled voltage source in series with each of the two inductors. The voltage is set as M*di/dt where M is the mutual coupling coefficient you are trying to model. For example one of the two controlled sources in series with inductor L1 with current i1 is M(di2/dt) where i2 is the current through the second inductor. A second model uses three non-coupled inductors whose L values are L1+M, L2+M, and -M or L1-M, L2-M, and M. The inductor of value M sits between the series connection of the the other two. Both of these create an equivalent circuit for a mutual inductor without the need for a mutual inductor component. Shawn
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