Hi,


analogLib has the components "ind" and "mind" which can be used to model inductors and coupling between inductors. You can start simple by assuming that each side (primary and secondary) consists of two inductors with a tapping point between them. Then you can add the k-factors between the primary and secondary, and between the two halves of the coils. Draw out how you think the transformer should look like so that you couple the inductors in the right direction. As for the loss, I suggest you assume the transformer is ideal, and mentally add an insertion loss to your design.


regards,
Aaron

Hi,


Usually we need to design our own transformers. I thought you were at the very initial design phase where you haven't yet designed your transformer and you just want a rough model for how it will work.

Assuming you have already designed your transformer using some EM simulator, you can directly use the s-parameters in cadence for the most accurate results (no modeling required). However, you may need an RLC model for certain simulations (transient analysis maybe). Every RLC model has a "model bandwidth" which says up to what frequency it is accurate. You can check this by simply overlapping the results between your EM-extracted s-parameters, and your model. Your model bandwidth should probably cover a few harmonics to be accurate. The more parasitic effects you model (e.g. substrate network, inter-winding capacitance etc), the higher the model bandwidth.

To get the best results I recommend you use wafer probing to correlate your process with you EM simulations, and then use the EM simulation S-parameters directly in your simulation.


regards,
Aaron