Two phone interview with the same hiring manager: First interview: All the question about my resume on Phase-locked loop and equalizer design in CMOS Second interview: 1. transfer function of open loop and closed loop system with first order 2. Noise cancellation and suppression of amplifers: lower down the noise figure of amplifer, wideband LNA noise cancellation techniques. 3. How to handle the problem of process, variation, temperature of amplifers. 4. What's the advantage of PMOS load over resistor load?