It was a phone interview and the interviewer was very friendly. It was a complete technical interview. Topics that were covered are: - Network analysis - Filters - Op-Amps - Oscillators - Signal Processing - Schimtt Charts - Non linearities - IP1, IIP3, 3rd harmonics - Noise Factor/Figure The interview was more of a discussion. If I failed to answer any questions the interviewer would explain the solution till I answered the question. It was a great learning experience.