Hi everyone - I've been self-studying electronics for the past couple years and I have a confession to make: I'm terrible at deriving transfer functions. I'd really like to improve at it, but every time I see a circuit like the following (to analyze for Z parameters, for example) I start to panic. http://en.wikipedia.org/wiki/File:Smal-signal_mirror_circuit.png Is some trick to go about analyzing a circuit like that? Or just draw up the nodes and try to grind it through with KCL? Any tips on how to get better at this important skill would be appreciated.