Abstract
In this study, wideband Doherty power amplifiers (DPAs) based on converters comprising one transformer and two capacitors are investigated. Moreover, the parallel and series-type Doherty combiners are investigated. The series-type Doherty combiner is shown to have wider characteristics than the parallel-type converter-based Doherty combiner via numerical analysis. An approximate analysis was applied to the series-type combiner, and a quasi-optimum design parameter was derived for wideband matching. A quasi-optimum design parameter was compared with a true optimum solution derived by numerical analysis, and its certainty was verified. A combiner with parameters close to the true optimum solution was designed and evaluated. A DPA fabricated using this combiner was adequately small for a 5G mobile handset and could be operated in the frequency range of 2.2–2.7 GHz with efficiency exceeding 35% and a sufficiently low distortion under an amplifying wideband modulated signal [fractional bandwidth (FBW): 4% = 0.1/2.5 GHz]. The proposed combiner and its design techniques helped in designing a compact and long battery life of 5G mobile phones with high data throughput at a few gigahertz frequency ranges.
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