#### justanavgme

##### Newbie

I'm an EE student and so far when I was assigned with a commonly known circuit (bandgap, LDO,...), I usually just look it up. I often find useful circuit topologies along with gain or PSRR equations already derived.

But what if I have to work with a new or not very well known circuit which has no proper documentation on how it works? Would you draw the small signal circuit from scratch and start deriving your own equations? What would be your initial approach?

Thank you in advance.