Broadband Digital Doherty Amplifiers for Sub-6 GHz 5G wireless Applications

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The power amplifier (PA) is the largest energy consumer in the base station for wireless communications, which consumes around 65% of the total energy of the base station. Therefore, the search for novel solutions to enhance the efficiency of the PA is always a critical topic in the RF transmitter system design. Among the efficiency-enhancing techniques, the Doherty PA (DPA) has been widely used in commercial base station applications due to its good performance and simple structure. However, the conventional DPA is of narrower bandwidth, which is not suitable for wideband communication standards such as 5G. To overcome the narrow bandwidth issue, Digital Doherty Power Amplifier (DDPA) architecture was proposed by Darraji and Ghannouchi at the iRadio lab of the University of Calgary. The published results demonstrated a substantial improvement of the power efficiency over wider bandwidth while meeting 4G standards in comparison with conventional analog DPA.This collaborative research proposal sponsored by Samsung AI Center (Canada) is in line with the research activities being conducted in the iRadio lab of the University of Calgary. This research proposal targets the development of DDPA for sub-6-GHz 5G communications to boost the performance of the wireless transmitter and reduce the system running energy cost. This proposal is targeting a wider RF bandwidth of 400MHz and solving the memory effects issue at both hardwire and software sides to achieve high efficiency and good linearity at the same time.The development of such Digital Doherty Power Amplifier is of great importance to 5G wireless networks. It is anticipated that Samsung AI Center (Canada) would further invest and support follow-up research and development activities to integrate and use the expected research results for their future base station infrastructure in Canada and elsewhere