Critical to the enablement and the fulfillment of next generation network energy efficiency, Power amplifiers (PAs) remain a center of focus to RF power base station markets. With an immense increase in cellular traffic, the performance of PAs should be constantly improved in terms of power efficiency, linearity, and bandwidth. The talk focuses on several aspects for enabling high efficiency and bandwidth for small cell PAs for 5G applications. A variety of PA design methodologies for broadband class F, F-1,2nd HT have been proposed and implemented to achieve state of the art performance. The talk focuses of different aspects of RF Power transistors technology evaluation specific to gallium-nitride based PAs. For the first time, class GF and GF-1 amplifiers which have demonstrated outstanding performance by simultaneously tackling both input and output harmonics. The talk also addresses the conventional mystery of so called second harmonic efficiency “null” in design of high efficiency PAs. The study reveals new directions for active harmonic load pull, technology evaluation for RF devices and design procedure for high efficiency PAs, which enables PAs in context of wide bandwidth, high efficiency without compromising the quality of service.
Tushar Sharma (S’10) received the B.Tech. Degree in electronics and communications engineering from Guru Gobind Singh Indraprastha University, Delhi, India. He completed Ph.D. degree at the University of Calgary, Calgary, AB, Canada in 2018. In 2016 and 2017, he joined NXP Semiconductors, Chandler, AZ, USA, as a Research and Development RF engineer to work in field of gallium nitride technology evaluation and design for 5G base station. Mr. Sharma is a recipient of the Izaak Walton Killam Pre-Doctoral Scholarship, Alberta Science and Innovation Under 30 Future leader award ,the AITF Doctoral Scholarship, the Alberta Transformative Talent scholarship, the Academic Excellence Award, and the Research Productivity Award. He has authored and coauthored over 17 refereed publications. His current research interests include high-efficiency broadband RF power amplifiers, waveform engineering techniques for power amplifiers, and active/passive load-pull techniques.