3.5-0Hz High-Efficiency Broadband Asymmetric Doherty Power Amplifier for 5G Applications

This paper presents a high-efficiency broadband Doherty Power Amplifier (DPA) architecture for the S-band covering from 3.3GHz up to 3.55GHz, aiming on 5G applications. The DPA based on low-pass like output matching structure and modified higher back-off combining network was designed and fabricated. Continuous Wave (CW) measurement results show that the proposed PA delivers a saturated output power of more than 47.5dBm, and holds a Power-Added-Efficiency(PAE) of more than 600% (at 7.5dB back-off) at all frequencies except 3.3GHz, which is about 53% with a saturated PAE range of 47%-58% within bandwidth. Also the 20 MHz LTE modulation signal measurement achieves the high efficiency and linearity performance of DPA, with a PAE of more than 50.6% at 8.5 dB back-off and an ACPR of -46.7 dBc.