AC-Stacked Power Amplifier for 5G Mobile Handset Applications in Band n77

This paper describes the design, implementation and measurement of a power amplifier (PA) for the fifth-generation (5G) mobile handset applications operating in Band n77 (3.3-4.2 GHz). The power stage of the PA applies an AC (Alter-nating Current) -stacked method to meet the requirements of the limited supply voltage and the increasing output power of 5G mobile handsets. The implemented PA module delivers the linear gain of more than 31.3 dB in the entire of Band n77 and the output power of more than 28.7 dBm and 27.3 dBm from 3350 MHz to 3900 MHz and at 4150 MHz, respectively, at a 3.4 V supply voltage under the modulation condition of a 5G-NR (New Radio) 100 MHz signal.