Gorre, P.Kumar, R.Song, H.Kumar, S.2026-02-082021Lecture Notes in Electrical Engineering, 2021, Vol.719, , p. 117-132978981968002397898195427349789819540440978981965847397898196005719783032147417978981954048897898196442929789819637577978981966339218761100https://doi.org/10.1007/s11665-025-11054-3https://idr.nitk.ac.in/handle/123456789/33762The chapter discusses the basic elements in the design of mm-wave CMOS Power Amplifier (PA) for phased arrays integration, focusing the next-generation 5G mobile communication. Power Amplifier design metrics, along with implementation of beam-forming phased arrays to merge power over-the-air are discussed in brief. The explanation begins with CMOS unique advantages, real-time handset challenges, system-level constraints, and design challenges are conceptually demonstrated with the help of a basic single-stage transistor Power Amplifier. © Springer Nature Singapore Pte Ltd. 2021.