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| Design and implementation of a band expansion method for Doherty power amplifier
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| (1. School of Science， Wuhan University of Technology， Wuhan， Hubei 430070， China； 2. Hubei Engineering Research Center of RF-Microwave Technology and Application, Wuhan, Hubei 430070, China； 3. School of Information Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China; 4. China Research Institute of Radiowave Propagation, Qingdao， Shandong 266107, China)
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Abstract 5G and beyond communication systems need wider bandwidth compared to 4G communication system. To break through the narrow band limitation of conventional Doherty power amplifier, a method was proposed to broaden the bandwidth. Two impedance matching was used to design output matching circuit of main power amplifier properly， and the post-matching structure was used to optimize the power synthesis network. A simple and wideband circuit structure of Doherty power amplifier was formed. To verify the proposed method, the 3.3-3.7 GHz Doherty power amplifier with GaN transistors CGH40010 was designed and measured. The measurement results show that the designed Doherty power amplifier has bandwidth ranging from 3.3 to 3.7 GHz with saturated power of 43.2-44.5 dBm and saturated gain of 8-11 dB. The drain efficiencies at saturation and 6 dB output power back-off level are 67%-76% and 42%-56%， respectively.
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Received: 23 January 2022
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| ［1］ |
CHOI W, KANG H, OH H, et al. Doherty power amplifier based on asymmetric cells with complex combining load[J]. IEEE Transactions on Microwave Theory and Techniques, 2021, 69(4): 2336-2344.
|
| ［2］ |
LI M, PANG J Z, LI Y, et al. Bandwidth enhancement of Doherty power amplifier using modified load modulation network[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2020, 67(6): 1824-1834.
|
| ［3］ |
ABDULKHALEQ A M, YAHYA M A, MCEWAN N, et al. Recent developments of dual-band Doherty power amplifiers for upcoming mobile communications systems[J]. Electronics, 2019, 8(6):638-656.
|
| ［4］ |
ZHOU X Y, CHAN W S, FENG W J, et al. Broadband Doherty power amplifier based on coupled phase compensation network[J]. IEEE Transactions on Microwave Theory and Techniques, 2021, 70(1):210-221.
|
| ［5］ |
JIA W Q, YU H X, YANG F, et al. A broadband Doherty amplifier with back-off efficiency enhancement[J]. IEEE Microwave and Wireless Components Letters, 2018, 28(8):723-725.
|
| ［6］ |
CHENG Z Q, XIONG G P, LIU Y, et al. High-efficiency Doherty power amplifier with wide OPBO range for base station systems[J]. IET Microwaves, Antennas & Propagation, 2019, 13(7):926-929.
|
| ［7］ |
周帅,刘成国,唐晓. 基于射频功率放大器的阻抗匹配技术[J]. 河南科技大学学报(自然科学版)， 2018,39(5): 94-99.
|
|
ZHOU S, LIU C G, TANG X. Impedance matching technology based on radio frequency power amplifier [J]. Journal of Henan University of Science and Technology (Natural Science)， 2018,39(5): 94-99. （in Chinese）
|
| ［8］ |
唐晓，丁肇宇，吴志鹏，等. 微波功率放大器三阶交调特性与实验测量[J]. 电视技术, 2019,43(2): 92-97.
|
|
TANG X, DING Z Y, WU Z P, et al. Third order intermodulation characteristics and experimental measurement of microwave power amplifier[J]. Video Enginee-ring, 2019, 43(2): 92-97. （in Chinese）
|
| ［9］ |
BATHICH K, MARKOS A Z, BOECK G. Frequency response analysis and bandwidth extension of the Doherty amplifier[J]. IEEE Transactions on Microwave Theory and Techniques, 2011, 59(4):934-944.
|
| ［10］ |
CHEN S C, WANG G F, CHENG Z Q, et al. A bandwidth enhanced Doherty power amplifier with a compact output combiner[J]. IEEE Microwave and Wireless Components Letters, 2016, 26(6):434-436.
|
| ［11］ |
PANG J Z, HE S B, HUANG C Y, et al. A post-mat-ching Doherty power amplifier employing low-order impedance inverters for broadband applications[J]. IEEE Transactions on Microwave Theory and Techniques, 2015, 63(12):4061-4071.
|
| ［12］ |
孔娃,夏景. 基于双阻抗匹配的宽带Doherty功率放大器设计[J]. 江苏大学学报(自然科学版), 2017, 38(6):682-686.
|
|
KONG W, XIA J. Design of wideband Doherty power amplifier based on two impedance matching network [J].Journal of Jiangsu University (Natural Science Edition), 2017, 38(6): 682-686. （in Chinese）
|
| ［13］ |
NAN J C, WANG H, CONG M F, et al. A broadband Doherty power amplifier with a new load modulation network[J]. IEEE Access, 2021, 9:58025-58033.
|
| ［14］ |
SHEN C, HE S B, ZHU X Y, et al. A 3.3-4.3 GHz high-efficiency broadband Doherty power amplifier[J]. IEEE Microwave and Wireless Components Letters, 2020, 30(11): 1081-1084.
|
| ［15］ |
FAN M, ZHU X W, XIA J, et al. A new approach to design a broadband Doherty power amplifier via dual-transformation real frequency technique[J]. IEEE Access, 2018, 6:48588-48599.
|
| ［16］ |
ZHANG Z W, FUSCO V, CHENG Z Q, et al. Design of a quadband Doherty power amplifier with large power back-off range[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2021, 68(9): 3598-3610.
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