spiral inductor simulation, multimode s-matrix

Hallo,

when simulation spiral inductors, we normally extract the single ended and/or differential quality factor from Y parameters.
It describes the device together with the inductance value from an R-L series equivalent circuit.

What about simulating an DIFFERENTIAL SPIRAL INDUCTOR with DIFFERENTIAL and COMMON MODE excitation.
This leads to the real multimode scattering matrix.

But what then ? How to extract quality factor and inductance from the multimode matrix.

Thanks for all answers.

greets elektr0

you can transfer the 2port s parameter with balun and power divider the simulate the DIFFERENTIAL and COMMON MODE inductor and Q

@dingjingfeng

Thx for your answer, but i am interesting in real (calculated) multimode scattering parameters. Means excitation of COMMON and DIFFERENTIAL mode as input field of the structure. This results in one s-matrix for common and one for the differential mode. Another two s-matrices for the coupling between these two modes.

The question is how to extract L and Q from these matrices.

greets elektr0

wave port support for the differential port

???

an inductor is an two port device,you can simulate it with differential port.

but you still get an 2port S parameter(with dff and com mode)
and now you can calculate the inductor with an idea balun and power divider to get Differential Q and L