How to ensure flexible and efficient use of spectrum, from advanced 5G Doherty power amplifiers to digitally assisted wideband PA for 6G BTS

Together with both the development of device technologies and integration of analog and digital circuits, advanced power amplifier architectures have evolved to deal with ever-increasing system level requirements, making joint optimization of digital and analogue parts mandatory. Here, wideband RF PA and digital integration up to digitally assisted power amplifiers are introduced, and the designs and evaluations for wideband operation are shown for 5G advanced and 6G BTS.