@MihaiSava Then you are way out of your depth and need to go back a ways and bring yourself back up to speed. The transfer function would make the assumption of small signal analysis. Which likely means using a small-signal (derivative for some an operating point) version of either the transport or hybrid-\$\pi\$ large-signal non-linear models. And given the inductors and capacitors present, those models should include various parasitics, not only for the bipolar devices themselves but also for how this is to be constructed in real life. If you expect to build one, anyway.
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