Results 181 to 190 of about 134,248 (260)

Broadband Doherty Power Amplifier Using Short Ended λ/4 Transmission Lines Based on the Analysis of Negative Characteristic Impedance

IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 2023
This paper presents a broadband Doherty power amplifier (DPA) using quarter-wavelength ( $\lambda $ /4) transmission lines with negative characteristic impedance. In conventional DPA designs, the load modulation network is frequency-dependent, leading to
Jin-Xu Xu, Hang Chen, Wen-hua Chen, Xiu Yin Zhang   +3 more
semanticscholar   +1 more source

Odd-mode Doherty power amplifier

2016 IEEE MTT-S International Microwave Symposium (IMS), 2016
This paper presents a novel doherty architecture, providing wideband efficient RF power amplification along-with wideband class-AB second harmonic terminations for a rugged and reliable operation. A prototype is developed, based on this architecture which provides more than 40% average efficiency at an average output power of 220W over most of the UHF ...
Jawad H. Qureshi, Walter Sneijers, John Gajadharsing   +2 more
openaire   +1 more source

Broadband Highly Efficient Doherty Power Amplifiers

IEEE Circuits and Systems Magazine, 2020
Modern wireless communication systems with large bandwidth and high peak-to-average power ratios (PAPRs) have been and will continue to be in high demand. This puts a strain on the transmitter, which has to operate with its average power in the output back-off (OBO) region. The Doherty power amplifier (Doherty PA) was invented in 1936 as an alternative
Xin Yu Zhou, Wing Shing Chan, Shichang Chen, Wen Jie Feng   +3 more
openaire   +1 more source

Simplified All-in-One Load Network of the Broadband Doherty Power Amplifier

IEEE transactions on microwave theory and techniques
A simplified all-in-one load network of Doherty power amplifier (DPA) was proposed for extended back-off range and broadband operation in this study. Although the proposed load network was simplified to just have a postmatching network (PMN) and compact ...
Yifei Chen, Woojin Choi, Jaekyung Shin, Hyeongjin Jeon, Sooncheol Bae, Soohyun Bin, Young Chan Choi, Hansik Oh, Hyunuk Kang, Kang-Yoon Lee, Keum Cheol Hwang, Youngoo Yang   +11 more
semanticscholar   +1 more source

An Inverted Doherty Power Amplifier Insensitive to Load Variation With an Embedded Impedance Sensor in Its Output Power-Combining Network

IEEE transactions on microwave theory and techniques, 2023
This article presents an inverted Doherty power amplifier (IDPA) made load insensitive up to 2:1 voltage standing wave ratio (VSWR) across its fractional bandwidth with a very compact wideband impedance sensor embedded in its output power-combining ...
G. Singh, H. Nemati, M. Alavi, L. D. de Vreede   +3 more
semanticscholar   +1 more source

A 28-GHz 26.8-dBm Doherty Power Amplifier With Four-Way Differential Hybrid Load- Modulated Combiner in 55-nm CMOS

IEEE Microwave and Wireless Technology Letters, 2023
This letter presents a 28-GHz high-power four-way differential Doherty power amplifier (PA) in 55-nm bulk CMOS technology. A transformer-based hybrid load-modulated combiner (HLMC) (i.e., a parallel combined series-load-modulated Doherty output network ...
Zonglin Ma, Zheng Ma, Kaixue Ma, F. Meng, Keping Wang   +4 more
semanticscholar   +1 more source

Simplified Doherty power amplifier structures

2015 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), 2015
We present two simplified Doherty power amplifier (DPA) structures to eliminate a quarter-wavelength impedance inverter used in the conventional DPA structure. The simplified DPA structures reduce the number of the impedance inverters, therefore they can be easily adopted in the broadband/multi-band applications of the DPA.
Han Ren, Jin Shao, Bayaner Arigong, Mi Zhou, Song Fu, Jun Ding, Hyoungsoo Kim, Hualiang Zhang   +7 more
openaire   +1 more source

Automatic multi‐objective particle swarm optimization method for effective Doherty power amplifier design

International journal of numerical modelling
In this paper, an automatic multi‐objective particle swarm optimization (AMOPSO) method is developed for the design of Doherty power amplifiers (DPAs).
Zefang Hao, Yan Qu, Jiajun Huang, G. Crupi, Jialin Cai   +4 more
semanticscholar   +1 more source

A 3-Way GaN Doherty Power Amplifier for 28 GHz 5G FR2 Operation

Intelligent Memory Systems, 2023
This paper presents the design, fabrication, and experimental characterization of a 3-way multi-stage Doherty amplifier working in the 5G NR FR2 bands centered at 28 GHz.
A. Piacibello, R. Giofré, P. Colantonio, V. Camarchia   +3 more
semanticscholar   +1 more source

Design of Wideband Asymmetric Doherty Power Amplifier Using a New Phase Compensation Technique

IEEE Transactions on Circuits and Systems Part 1: Regular Papers
This article proposes a new phase compensation technique to expand the operating bandwidth of an asymmetric Doherty power amplifier (ADPA). Its operation principle is to increase the solution space of network parameters, thereby contributing to the ...
Zhijiang Dai, Shuman Kong, Wei Feng, Shen Tian, W. Shi, Jingzhou Pang, Mingyu Li   +6 more
semanticscholar   +1 more source