Mostly questions about your experience, and they'll ask details about the specific circuits you're working on. I worked on clocking, so they asked about CDR bandwidth, how PI works, how to do multiphase gen. Also, some basic questions like differential pair, opamps and common mode operation.
Draw a low pass filter. What is the transfer function? Draw the Bode plots.
Elettronica analogica di base
Mostly OpAmp and current-mirror based questions
What and where are the poles for a given op-amp?
OTA design, Switch capacitor circuits
Technical and leadership questions to show the technical knowledge and the soft skills
Basic RC circuit questions Frequency response, low pass filters
Basic Analog questions, Depth on projects where we worked
Digital: gate-level combinational logic to realize various functions, timing analysis for sequential logic, various fan-out loading questions (I don't remember too many details about this line of questioning, sorry) Analog: standard circuit design questions including: transistor equations, single transistor amplifiers, current mirrors, cascoding, diff-pairs, op-amps, analog layout pitfalls, and basic process-related concepts (parasitics, body effect, threshold voltage trick questions, etc).
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