This paper proposes a technique which allows quadband impedance matching and level shifting Doherty power amplifier (DPA) design. By using novel coupler networks with reactance choosing appropriate complex load impedances, the DPA can reach back-off range (OBO) of over 9 dB. In addition, peak PA branch carrier use different network parameters in order to satisfy requirements. To illustrate desi...

The Doherty power amplifier (DPA) is one of the most popular power amplifier architectures for obtaining high average efficiency for modern communication signals with high peak-to-average power ratios (PAPR). However, the DPA suffers from often having narrowband performance which limits its capabilities in wideband and/or multi-standard microwave and radio frequency applications. In this thesis...