Screening:
- Skype interview
- Questions on LNA design, degeneration, noise analysis, NF of cascaded blocks, NF analysis of phased array
- Power gain vs voltage gain, impedance matching, s-parameters
- Basics of PA design, loadpull vs conjugate matching, optimum load, class A,B etc.
On-site:
-1 on 1 interview with about 6-7 people, around 45 mins each
- Wilkinson divider, insights into how 100 ohm isolates in standard design, Inductor model, differential vs single-ended inductors, current crowding
- LC tanks and impedance movement wrt frequency on Smith chart
- Complete design procedure of LNA
- Input output impedances of different amplifiers common source, common gate etc.
- EM related questions, EM ports, de-embedding, co-calibration, parasitic coupling between EM ports
- SiGe device structure, analysis of BJT based cascode amplifier gain
- Analog questions, gain boosting, differential amplifier, little bit about opamp, stability, time domain analysis of RL, RC circuits etc.
- 45 min presentation on PhD work
Overall, I found Anokiwave to be a great company. Everyone in the team looked happy and positive. Screening interview was more difficult than on-site in my experience. HR was also helpful and responded on time.