My friend had referred me for this position. I got a call for telephonic interview a week later.
Telephonic interview:
1.Noise Margin and some questions on NML and NMH for inverter connected back to back
2. Bandwidth related questions
3. Flip Flop and latches ( race-around and S-R invalid related questions )
4. Time constant
5. RC circuit related
This round is to just test your basics
1st round :
This was done by manager. He will test your understanding on RC circuits charging,discharging graphs etc, transistors, op-amps, CMOS( resistance graph, transfer characteristic graph, region of operation, pass transistor). The manager usually doesn't scare u out by asking unrelated, he will see your understanding if you go somewhere wrong in analyse he will help and try u to make understand. I am sure you will surely learn many things from this interview
2nd round: wolf pack (done by 4 people) topics remain same , u might expect some questions on micro-controller and coding
3rd round: Same topics but some aptitude kind of questions to test your ability to think.