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In this paper, we present a dual-band Sequential Power Amplifier (SPA) to provide high efficiency at power back-offs and maximum output power at two working frequencies. The proposed SPA consists of a carrier amplifier, a peaking amplifier, a power divider and a combining coupler. The SPA provides 48 % and 62 % drain efficiency (DE) at 6 dB output back-off (OBO) and maximum output power at 1.1 GHz,...
We present two simplified Doherty power amplifier (DPA) structures to eliminate a quarter-wavelength impedance inverter used in the conventional DPA structure. The simplified DPA structures reduce the number of the impedance inverters, therefore they can be easily adopted in the broadband/multi-band applications of the DPA. To prove the design concept of the simplified DPA structures, a dual-band...
This paper presents the design and the applications of dual-band microwave power amplifiers using GaN transistors. First, a dual-band power amplifier using dual-band transmission line (TL) impedance matching networks, which can simultaneously match two different complex impedances to 50 Ω at two uncorrelated frequencies, is introduced. Secondly, design of a dual-band GaN based Doherty power amplifier...
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