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High-Efficiency Dual-Band Filtering Doherty Power Amplifier Based on Multi-Function Circuit
Chen, Hang1; Xu, Jin Xu2; Chen, Wenhua3; Zhang, Xiu Yin1
2022-05
Source PublicationIEEE Transactions on Microwave Theory and Techniques
ISSN0018-9480
Volume70Issue:5Pages:2697-2709
Abstract

This article presents a high-efficiency dual-band filtering Doherty power amplifier (DPA) using multi-function circuits for simplifying the structure. A dual-band filtering power combiner also plays the role of real-to-real impedance matching, in which one resonator is shared by both the power combing and filtering circuits. Thus, only one extra resonator is needed for the power combiner to provide second-order dual-band filtering responses, which contributes to high efficiency of the DPA. Transmission zeros are generated between the two passbands, realizing a sharp roll-off rate and greatly enhancing the isolation between the two passbands. Meanwhile, an impedance control network is designed to simultaneously suppress the harmonics and transform the optimized complex impedance desired by the transistor to a real one. In this way, the output matching network and extra filter in conventional design are realized by the filtering power combiner and impedance control network in the proposed design, resulting in a simpler structure. A dual-band DPA operating at 2.14 and 2.6 GHz is implemented with the measured peak efficiencies of 64.4% and 69% at the output power of 43.25 and 43.3 dBm, respectively. The 6-dB back-off efficiencies are 50% and 57% at the two passbands. Under 20-MHz long term evolution (LTE) modulated signals with a peak-to-average power ratio (PAPR) of 7.5 dB, the DPA after digital predistortion (DPD) is measured with an adjacent channel leakage ratio (ACLR) of better than -45.2 dBc and the efficiencies of 51.6% and 54.3% at interested bands. The peak efficiency under the excitation of the concurrent modulated signal is 48.6%.

KeywordDoherty Power Amplifier (Dpa) Dual Band Dual-band Amplifier Dual-band Filtering Responses Filtering Power Combiner High Efficiency High Selectivity Impedance Multi-function Circuit. Peak To Average Power Ratio Power Combiners Power Transmission Lines Transforms Wireless Communication
DOI10.1109/TMTT.2022.3154756
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000770571300001
Scopus ID2-s2.0-85128494800
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Cited Times [WOS]:0   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorZhang, Xiu Yin
Affiliation1.Engineering Research Center for Short-Distance Wireless Communications and Network, Ministry of Education, School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China.
2.School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China, and also with the State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China.
3.Department of Electronic Engineering, Tsinghua University, Beijing 100084, China.
Recommended Citation
GB/T 7714
Chen, Hang,Xu, Jin Xu,Chen, Wenhua,et al. High-Efficiency Dual-Band Filtering Doherty Power Amplifier Based on Multi-Function Circuit[J]. IEEE Transactions on Microwave Theory and Techniques,2022,70(5):2697-2709.
APA Chen, Hang,Xu, Jin Xu,Chen, Wenhua,&Zhang, Xiu Yin.(2022).High-Efficiency Dual-Band Filtering Doherty Power Amplifier Based on Multi-Function Circuit.IEEE Transactions on Microwave Theory and Techniques,70(5),2697-2709.
MLA Chen, Hang,et al."High-Efficiency Dual-Band Filtering Doherty Power Amplifier Based on Multi-Function Circuit".IEEE Transactions on Microwave Theory and Techniques 70.5(2022):2697-2709.
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