Dual-Mode Orthogonal Doherty Power Amplifier with Efficiency Enhancement and Load Mismatch Adaptability

This is the authors' abstract. We don't add key points for this paper.

This study proposes an efficiency-enhanced dual-mode orthogonal Doherty power amplifier (ODPA) architecture. The operation theory, design process, and implementation of the proposed ODPA are introduced in detail. By introducing an orthogonal architecture with control signal power injection and incorporating a modified output matching network, the efficiency of Doherty power amplifiers under active load modulation can be enhanced. Furthermore, owing to the additional degrees of freedom provided by the orthogonal architecture, which enables independent amplitude and phase control and dynamic reshaping of the load modulation trajectories, and the dual-mode reciprocal bias configuration, the proposed ODPA exhibits high adaptability to load mismatch. To validate the proposed architecture, a 2.1-GHz dual-mode ODPA is designed and fabricated. With a matched load, the fabricated dual-mode ODPA exhibites over 60% drain efficiency throughout the power range from 6-dB output back-off (OBO) to saturation. For mismatched loads with a 2:1 voltage standing wave ratio, a saturated output power of 42.8–44.6 dBm and OBO efficiency of 47.2%–58.1% are obtained through mode reconfiguration.