publication . Article . 2018

Bandwidth enhancement of three-device Doherty power amplifier based on symmetric devices

Guohua Liu; Zhiqun Cheng; Ming Zhang; Shichang Chen; Steven Gao;
Open Access English
  • Published: 24 Jan 2018
  • Country: United Kingdom
Abstract
This paper proposes a method for extending the bandwidth of\ud a three-device Doherty power amplifier (DPA) based on symmetric devices.\ud ?/4 transmission lines are inserted between each peaking amplifier output\ud and carrier amplifier output to compensate load impedance of carrier amplifier.\ud In order to achieve perfect load modulation, carrier amplifier output\ud circuit total electrical length is designed to 90 degrees, and the peak amplifier\ud output total electrical length is designed to 180 degrees. The proposed\ud method is demonstrated by designing a three-device broadband DPA using\ud three 10-W packaged GaN HEMT devices. Measurement results show t...
Subjects
free text keywords: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Modulation, Electrical length, Optoelectronics, business.industry, business, Electric power transmission, Amplifier, Electronic engineering, High-electron-mobility transistor, Frequency band, Computer science, Input impedance, Bandwidth (signal processing)
Related Organizations

[1] S. Chen and Q. Xue: “Optimized load modulation network for Doherty power amplifier performance enhancement,” IEEE Trans. Microw. Theory Techn. 60 (2012) 3474 (DOI: 10.1109/TMTT.2012.2215625).

[2] S. Chen, et al.: “A bandwdith enhanced Doherty power amplifer with a compact output combiner,” IEEE Microw. Wireless Compon. Lett. 26 (2016) 434 (DOI: 10.1109/LMWC.2016.2558108).

[3] A. M. M. Mohamed, et al.: “Doherty power amplifier with enhanced efficiency at extended operating average power level,” IEEE Trans. Microw. Theory Techn. 61 (2013) 4179 (DOI: 10.1109/TMTT.2013.2288604).

[4] K. Bathich, et al.: “Frequency response analysis and bandwidth extension of the Doherty amplifier,” IEEE Trans. Microw. Theory Techn. 59 (2011) 934 [OpenAIRE]

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