I was asked to draw a circuit then explain how it worked and what everything did. I ended up going over op amp circuits (inverter and difference op amp), explaining how a transistor works, and drawing and explaining a cmos inverter. I was also asked the question, what is your biggest/greatest achievement? There were some other behavior questions as well that seem pretty standard at most interviews such as describing a situation where you've worked on a team and talking about something going wrong in a team environment.