Design of GaN Doherty Power Amplifiers for Broadband Applications

Shao, Jinghai; Zhou, Rongguo; Ren, Han; Arigong, Bayaner; Zhou, Mi; Kim, Hyoung Soo; Zhang, Hualiang

doi:10.1109/lmwc.2013.2293659

Cited by 32 publications

(29 citation statements)

References 7 publications

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“…In [7]- [10], different characteristic impedances were used for the Doherty impedance inverter to improve the operational bandwidth and efficiency. In [11], the amplifier branches were designed for load impedance of 70 to improve the bandwidth of the Doherty amplifier. In another technique presented in [12] and [13], multi-line output combiners were used to improve the operational bandwidth.…”

Section: Analytical Design Methodology For Genericmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

Akbarpour

Helaoui

Ghannouchi

2015

IEEE Trans. Microwave Theory Techn.

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In this paper, a new Doherty amplifier architecture along with an analytical based design methodology is proposed. The proposed architecture uses novel three-port network as the output matching/combining network (OMCN). The three-port OMCN performs the power combining for any arbitrary output power ratios from the two transistors of the Doherty amplifier. It also performs the impedance matching from any arbitrary complex load impedance to the optimum impedances for both transistors at peak output power. Commonly in Doherty amplifiers, an optimum performance at peak power and a sub-optimum performance at power back-off are often obtained. Using the proposed output network, optimum performance can be reached at power back-off, as well as at peak power. Another three-port network is proposed for input matching/dividing network (IMDN) at the input of the proposed Doherty amplifier. The three-port IMDN is designed to perform the power division with any arbitrary division ratio, adjust the arbitrary phase difference between the input signals to the two transistors, and provide the impedance matching from any arbitrary complex source impedance to the optimal source impedances for the two transistors. To verify the provided theory, two prototype amplifiers are designed and tested. A 12-W amplifier is designed for a 50source and load impedances at 1 GHz. Another 12-W amplifier is designed at 1 GHz for complex source and load impedances. Both amplifiers have efficiency of higher than 50% at 7-dB output power range.Index Terms-Back-off, Doherty amplifier, efficiency, peak-toaverage power ratio (PAPR), three-port network.

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Section: Analytical Design Methodology For Genericmentioning

confidence: 99%

“…The transformer-less load-modulated (TLLM) amplifier was proposed in [24] to obtain Doherty performance without using the impedance inverter. Also in [25] and [26], Doherty amplifiers were implemented without using the Doherty impedance inverter to increase operational bandwidth.…”

Section: Analytical Design Methodology For Genericmentioning

confidence: 99%

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

Akbarpour

Helaoui

Ghannouchi

2015

IEEE Trans. Microwave Theory Techn.

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“…A completely different solution is used in [42]: in this design, the impedance inverter is removed, but still good results in terms of back-off PAE are achieved thanks to an appropriate matching. Despite it may be questionable if this PA can still be considered a Doherty, the measured results on the prototype are very good: on the 0.8-1.2 GHz band, the output power is higher than 40.2 dBm, with 6 dB OBO efficiency higher than 30%.…”

Section: A Matching Network Optimizationmentioning

confidence: 99%

The Doherty Power Amplifier: Review of Recent Solutions and Trends

Camarchia

Pirola

Quaglia

et al. 2015

IEEE Trans. Microwave Theory Techn.

204

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In this paper, an extensive review of the most up-to-date papers on microwave Doherty power amplifiers is presented. The main applications are discussed, together with the employed semiconductor technologies. The different research trends, all aimed to improve the advantages of the Doherty scheme and to solve its inherent drawbacks, are presented. The first considered topic is the maximization of efficiency and/or linearity, where analog and digital techniques are exploited. Another important trend is the bandwidth enlargement of the Doherty architecture, that involves a large number of papers. Multi-band, multi-mode solutions are also considered, using either fixed or reconfigurable solutions. The final section is dedicated to the most significant Doherty integrated implementations.Index Terms-Doherty power amplifier, gallium arsenide, gallium nitride, linearization, wireless communications.

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“…In past literatures, many designs and implementations of dual-band Doherty architecture [6][7][8] and broadband Doherty amplifier [9][10][11][12][13][14][15][16][17] have been reported. It is worth mentioning that dual-band technologies have the limitation of a high frequency-ratio, while in practical situation, taking China Mobile for instance, the frequency-ratio of 2G standard (GSM1800) and 3G standard (TD-SCDMA) is only about 1.11.…”

Section: Introductionmentioning

confidence: 99%

“…Various technologies and structures are proposed to broaden bandwidth of Doherty PA. For instance, a wideband DPA with a simplified structure is reported with a fractional bandwidth of 35% in [9]. In [17], a new matching strategy is proposed, that is, the two PAs are not matched to 50 Ω, thus to eliminate the quarter-wave transmission lines. Finally the Doherty power amplifier with 40% bandwidth is reported.…”

Section: Introductionmentioning

confidence: 99%

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

Ye¹,

Wu²,

Liu³

2014

PIER C

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Abstract-A broadband power amplifier designed and implemented in Doherty configuration is illustrated in this paper. Both input and output networks adopt the broadband matching topology. Additionally a compensation network, consisting of a series transmission line shunted with a capacitance, is set behind the peak amplifier to avoid in-band power leakage in the low-power section while at the cost of peak output power in partial band. A novel coupler is designed as an uneven power-divided splitter and experimentally validated for a broadband power amplifier module. A tradeoff of bandwidth, efficiency and output power is fulfilled through parameters select and postproduction tuning. According to the measured results, the proposed broadband Doherty power amplifier achieves an average saturated output power of 42 dBm, an average gain of 10.6 dB, an average peak and 6 dB back-off efficiency of 48.4% and 32.8%, respectively, and a fractional bandwidth of 51.4%, from 1.3 GHz to 2.2 GHz. The adjacent channel power ratio is better than −40 dBc when the amplifier is driven with 10-MHz QPSK signal, thus exhibiting a high linearity performance.

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Design of GaN Doherty Power Amplifiers for Broadband Applications

Cited by 32 publications

References 7 publications

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

The Doherty Power Amplifier: Review of Recent Solutions and Trends

A Tradeoff Design of Broadband Power Amplifier in Doherty Configuration Utilizing a Novel Coupled-Line Coupler

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