Summary
This paper introduces a new theory which can be applied for the design of over‐octave ultra‐wideband power amplifier (PA). In this methodology, the impedance space of the ultra‐wideband PA can be refined, and the fundamental and various harmonic impedances have the same impedance space. This theory solves the problem that the harmonic impedance is not located in the fundamental impedance space because of its pure reactance form in the traditional hybrid continuous mode. To verify this theory, an ultra‐wideband PA with operating frequency range of 0.5–3.0 GHz (relative bandwidth of 143%) has been designed and fabricated. The experimental results show that the saturated output power over the entire operating band is 38.6–42.4 dBm, the power gain is 10.2–14.6 dB, and the corresponding saturated drain efficiency is between 50.1% and 65.1%.
SummaryThere is a large efficiency degradation between the two efficiency peaks in a broadband Doherty power amplifier (DPA) when the working frequency deviates from the center point. In this paper, dual‐input technique is adopted to improve the conversion efficiency over the dynamic power range in broadband DPAs. The efficiency between the two efficiency peaks in the DPA is enhanced through dynamically control the input power levels of the carrier and peaking power amplifiers (PAs) as well as the phase difference between the two sub‐amplifiers. As a proof of concept, a broadband dual‐input DPA (DI‐DPA) operating over 1.1–2.2 GHz is fabricated and measured in this paper. Experimental results show the fabricated DI‐DPA delivers a saturation output power of 43.5–44.7 dBm with a gain of 9.6–11.5 dB and a drain efficiency of 50.5%–58.6% in the interested frequency band. Meanwhile, a 6 dB back‐off drain efficiency of 40.4%–65.8% is also obtained by the DI‐DPA over 1.1–2.2 GHz.
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