Journal
IEEE ACCESS
Volume 11, Issue -, Pages 28771-28780Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2023.3259906
Keywords
Impedance; Manganese; Power amplifiers; Load modeling; Loading; Harmonic analysis; Optimization; Doherty power amplifier; high-efficiency power amplifier; load-pull; optimization; source-pull; wideband matching network
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This paper presents a novel and accurate procedure for designing a Doherty power amplifier (DPA) for wireless systems. The method involves a systematic approach to designing the matching networks of both Main and Auxiliary devices, and utilizes an optimization process to ensure their input impedance falls within the optimal regions obtained from load- and source-pull simulations. In addition, the paper proposes a method to accurately account for the loading effect of the Auxiliary amplifier on the Main one at back-off when designing the Main PA. Experimental results demonstrate the effectiveness of the proposed method.
This paper presents a novel and accurate procedure for designing a Doherty power amplifier (DPA) for wireless systems. The method is based on a systematic approach to designing the matching networks of both Main and Auxiliary devices, which employs an optimization process to set their input impedance in the corresponding optimal regions obtained from the standard load- and source-pull simulations. To import the optimum regions of each device into the optimization algorithm, mathematical expressions are derived and graphically reported on the Smith chart. Besides this, we have developed an accurate method to account for the loading effect of the Auxiliary amplifier on the Main one at back-off when designing the Main PA. As a proof of concept, a symmetric DPA is designed, fabricated, and tested. The measurements showed a working frequency band of 3.3-3.9GHz (aimed at n78 band of 5G-NR), a minimum peak output power of 36W, drain efficiency between 48%-53.2% at peak and 34.6%-44.5% at 6dB back-off.
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