Qualcomm Analog RFIC Engineer interview questions

Notified by email, took several days to schedule phone interview. The interviewer seems make no preparation at all and ask random questions: 1, Describe how the signal spectrum changes through receiver chain of Direct-Conversion Receiver and Heterodyne Receiver, and compare their advantages and disadvantages 2, Give the expression of wt of a MOSFET and derive its relationship with dimensions 3, Name the specs of receiver blocks: LNA, Mixer, VCO, etc