They asked this list of question 1 opamp phase shift 2.formulas of opamp 3.applications of opamp 4.low pass filter and high pass filter calculations 5.transistor switching daigram

The interview was lengthy. it went for 1 hour. Basically we had a discussion over project i had done in my current company. He asked me to make the schematic of the product the its elements used their circuits and use. like in controller i had DC-DC converter and LDO then its circuit and usage. push and pull register. Altium skills, or designing skills.