Analog design engineer interview questions shared by candidates
How to make sure the 2-stage opamp is stable? How does the compensation work?
Use compensation capacitor. Look up pole splitting which uses Miller effect on the capacitor.
By constructing current mirror circuit using op-amp 741 through compensation resistor at the feedback side. Finally the input and output of the op-amp gets compensated.
Using Miller compensation. A compensation capacitor across the 2nd stage to create pole splitting. A series resistor to the cap might be needed to solve the rhp zero problem
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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