Asymmetrical Doherty power amplifiers for LTE-Advanced systems

In this paper, the optimization approach of a wideband and high efficiency asymmetrical Doherty power amplifier (ADPA) for LTE-Advanced systems was presented. The ADPA using the different LDMOS devices and an uneven power divider achieves constant efficiency at more than 6 dB output power back-off....

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Bibliographic Details
Published in2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Vol. 4; pp. 1 - 4
Main Authors Chao Sun, Taijun Liu, Yan Ye, Ying Zhang, Xiaojun Luo, Hao Lin
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2012
Subjects
Communication systems
Educational institutions
Impedance
Power amplifiers
Power dividers
Power generation
Reactive power
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Summary:In this paper, the optimization approach of a wideband and high efficiency asymmetrical Doherty power amplifier (ADPA) for LTE-Advanced systems was presented. The ADPA using the different LDMOS devices and an uneven power divider achieves constant efficiency at more than 6 dB output power back-off. The radial stubs and duplicate supply are utilized in the dc bias network to increase the bandwidth of the ADPA. The carrier amplifier (MRF8S19140) and the peaking amplifier (MRF8S19260) operate at class-AB and class-C respectively. Through ADS optimization design, the power added efficiency (PAE) is 59.064% when the maximum output power reaches 57.1 dBm at 1950MHz. At 8.5dB back-off point, the PAE is 51%. The bandwidth of the ADPA is about 145MHz ranging from 1880MHz to 2025 MHz, maintaining the gain flatness lower than ±0.5dB in small signal mode. The PAE in the whole band basically remains 45% or more for medium power level.
ISBN:1467321842
9781467321846
DOI:10.1109/ICMMT.2012.6230281