Hi, I want to implement an integrated micro transformer like this https://ieeexplore.ieee.org/abstract/document/4592516. With gf180mcu tech is feasible?

Sky130 has 5VGS, 16V VDS transistors. If I'm not wrong, the maximum voltage differential allowed for GF180 is 6V. There are techniques to extend voltage ratings for such circuits using the process conventional transistors, but I don't think that is easy.

And the micro transformer is feasible?

Maybe. The problem is that for the free MPW sponsored by Google, you can't choose the package. You could use external transformers, as a proof of concept. Maybe, later, if there is an option for die only tapeout, you could use your own package to allow the micro transformer inside it alongside the die.

Okay thank you

Hi Filippo, I have used Fasthenry in the past to calculate the inductance of a structure. The last time I checked, the software is completely Open Source. Please do an internet search for Fasthenry to see if it is appropriate for your project. Here is a git hub link to a fasthenry repository. https://github.com/coldlogix/fasthenry