Multiband Doherty Power Amplifier Design for 5G NR Sub-6 GHz Handset Applications

In this paper, new multiband Doherty power am-plifier design for 5G NR Sub-6 GHz handset applications is proposed. The proposed Doherty power amplifier is demonstrated experimentally with GaAs-HBT. A PAE of 38.9% and a NR ACLR of -37.8 dBc at an average output power of 27.4 dBm are measured at 3.75 GHz under 5G NR 100 MHz, DFT-s-OFDM, QPSK operation. Moreover, the proposed Doherty power amplifier maintains more than 34.0% efficiency with a NR ACLR of below -35.6 dBc from 3.35 GHz to 5.15 GHz, corresponding to 5G NR Band n77 and Band n79.