Optimization Design of Wideband Asymmetric Doherty Power Amplifiers

Author

Cen, Like ; Liu, Taijun ; Ye, Yan ; Xu, Gaoming ; Zhao, Yangping

Author_Institution

Coll. of Inf. Sci. & Eng., Ningbo Univ., Ningbo, China

fYear

2011

fDate

23-25 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

Abstract-In this paper, a wideband asymmetric Doherty poweramplifier is designed with a short stepped impedance transformer instead of a conventional quarter-wavelength impedance transformer. The Doherty power amplifier is applied with a drain voltage of 18 V for the main amplifier and 27V for the peak amplifier. When the output power is 40 dBm, the wideband asymmetric Doherty power amplifier covers a bandwidth of 225 MHz ranging from 1.8 GHz to 2.025 GHz. The gain flatness is between 0.5 dB and the power added efficiency (PAE) in the whole band is larger than 40%. The designed Doherty power amplifier achieves a 1 dB compression output power of 50.22 dBm with a maximum PAE of 59.13% at 1.9 GHz. At about 8 dB power back-off from the 1dB compression point (P1dB), the PAE is 53.02%, and at about 10 dB power back-off from P1dB, the PAE reaches 44.56%.

Keywords

UHF power amplifiers; impedance convertors; optimisation; wideband amplifiers; bandwidth 1.8 GHz to 2.025 GHz; bandwidth 225 MHz; conventional quarter-wavelength impedance transformer; efficiency 44.56 percent; efficiency 53.02 percent; efficiency 59.13 percent; gain -0.5 dB; gain 0.5 dB; gain 1 dB; optimization design; power added efficiency; short stepped impedance transformer; voltage 18 V; voltage 27 V; wideband asymmetric doherty power amplifier; Impedance; Microwave communication; Multiaccess communication; Power amplifiers; WiMAX; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Conference_Location

Wuhan

ISSN

2161-9646

Print_ISBN

978-1-4244-6250-6

Type

conf

DOI

10.1109/wicom.2011.6036663

Filename

6036663