Divisional Load-Modulated Balanced Amplifier With Extended Dynamic Power Range

Shi, Weimin; Li, Xiaolong; Hu, Chunyu; Cai, Tianfu; Naah, Gideon; Dai, Zhijiang; Pang, Jingzhou; Li, Mingyu

doi:10.1109/tmtt.2022.3225305

Cited by 10 publications

References 35 publications

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Design of a mixed load‐modulation balanced power amplifier with ultra‐extended power back‐off range

Zhang,

Xuan

2024

Circuit Theory & Apps

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SummaryThis paper proposes a mixed design strategy to expand the power back‐off (OBO) range of the pseudo‐Doherty load‐modulation balanced power amplifier (LMBA). An asymmetric LMBA configuration is employed to increase the OBO range. The two PA branches of the balanced PA operate in different class‐C modes, thereby obtaining two OBO points. Further, an asymmetrical coupler is also introduced into the asymmetrical LMBA architecture to expand the OBO. Here, the relationship between the OBO and coupler's parameters and asymmetrical configuration parameters is built. The behaviors of the proposed PA as a function of input power are derived when several representative parameters are chosen. To validate the proposed topology, a PA with an OBO of 15 dB operating across 3.4–3.6 GHz is designed, fabricated, and tested. Measurements illustrate that the PA can deliver a saturated output power of 43.6–44.5 dBm with a drain efficiency ranging from 70% to 72%. Drain efficiencies are between 50% and 68% at the OBO of 15 dB. The LMBA implemented here shows state‐of‐the‐art performance in terms of the OBO range.

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Design of a mixed load‐modulation balanced power amplifier with ultra‐extended power back‐off range

Zhang,

Xuan

2024

Circuit Theory & Apps

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A 3.4–3.5 GHz mode‐reconfigurable power amplifier with high efficiency with load mismatch and back‐off

Hao,

Li,

Cai

et al. 2024

Micro & Optical Tech Letters

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In this letter, a mode‐reconfigurable power amplifier (MRPA) is proposed to address the low efficiency in back‐off range and drastic impedance mismatch issues in 5G communications. The power amplifier based on a three‐branch reconfigurable quadrature coupler, capable of switching between two operating modes, Doherty and Balanced, while achieving excellent back‐off efficiency and resistance to load mismatch in 3.4–3.5 GHz band. The measured results of the proposed MRPA demonstrated a Psat of 43.5 dBm, a peak saturation drain efficiency (DE) of 64%–75%, and a 6 dB output back‐off DE of 48%–64%, and maintains a DE of more than 37% at voltage standing wave ratio = 2:1 mismatch level; at modulated wave amplification, the MRPA has an adjacent channel power leakage greater than 35 dBc in a 20 MHz 64‐QAM signal test and greater than 30 dBc in a 50 MHz 5G‐NR signal test.

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