Power Efficiency and Linearity Enhancement Using Optimized Asymmetrical Doherty Power Amplifiers

Kim, Jangheon; Fehri, Bilel; Boumaiza, Slim; Wood, John

doi:10.1109/tmtt.2010.2086466

Cited by 140 publications

(53 citation statements)

References 21 publications

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“…It can be shown that P M,max = P DPA,max / √ OBO; thus, the Main amplifier delivers at maximum 1/4 of the maximum output power, while the remaining 3/4 must be provided by the Auxiliary, which should therefore be at least three-times larger than the Main (assuming Class-C bias and uneven power splitting) [34]. This solution is known as asymmetrical DPA [35][36][37][38]: the higher the level of asymmetry, the wider the HEPR. On the other hand, increasing asymmetry causes a severe gain reduction, due to the stronger influence of the inherently lower gain Class-C Auxiliary stage on the overall performance and to the reduced power delivered to the Main stage.…”

Section: High-efficiency Power Rangementioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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Section: High-efficiency Power Rangementioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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“…Thus, as (7) concludes, efficiency at the TP depends on the Re{Z L,C }. As investigated in [19], the frequency dependent Re{Z L,C } can be given as in (8) for the conventional structure:…”

Section: Wideband Doherty Combinermentioning

confidence: 99%

“…The Doherty power amplifier (DPA) is a strong candidate for multimode multiband operation due to its low hardware complexity, wide aggregated instantaneous bandwidth and tunable efficiency characteristic for different power ranges [3][4][5]. In order to improve the efficiency, various kinds of DPA architecture, such as bias adapted DPA, asymmetrical DPA and multi-stage DPA, have been proposed [6][7][8][9][10]. There have been Doherty amplifiers reported with enhanced back-off efficiency and improved linearity by the utilization of the inter-modulation cancellation and digital predistortion techniques [11,12].…”

Section: Introductionmentioning

confidence: 99%

Designing an Octave-Bandwidth Doherty Amplifier Using a Novel Power Combination Method

Sahan¹,

Demır²

2013

PIER B

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Abstract-In this paper, an octave bandwidth Doherty power amplifier (DPA) using a novel combiner is presented. The fundamental bandwidth limitation of the load modulation concept of a conventional Doherty structure is solved based on the proposed combination method. For verification, an octave bandwidth asymmetric Doherty architecture is implemented by using gallium-nitride (GaN) HEMT Cree CGH40010 and CGH40025 devices in the carrier and peaking amplifiers, respectively. The carrier and peaking amplifiers are designed to achieve optimal operation with 25 Ω load and source impedances. The reduced load and source impedances simplify the matching circuits for broadband operation. Key building blocks, including the proposed combiner, carrier and peaking amplifiers as well as the 50/25 Ω input power divider, are outlined. The measurement results represent higher than 37% and 52% drain efficiencies in 6 dB load modulation region across the frequency range from 0.85 to 1.85 GHz and 0.90 to 1.60 GHz, respectively. The implemented Doherty amplifier represents acceptable linearity across the whole operation frequency range. In two-tone signal characterization, the implemented DPA performs with a drain efficiency of 55% and an inter-modulation distortion (IMD) of −30 dBc at an average output power of 41.2 dBm at the center operation frequency of 1.35 GHz. In order to observe wideband signal characterization, a single carrier wideband code-division multiple access (W-CDMA) signal with a peak-to-average power ratio (PAPR) of 6.5 dB is applied and a drain efficiency of 51% with an adjacent-channel leakage ratio (ACLR) of −31 dBc is achieved at an average output power of 38.4 dBm.

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“…This means, how much of the power source is usefully applied to the amplifier's output [11]. The optimized PAE is plotted in Figure 7.…”

Section: Power Added Efficiencymentioning

confidence: 99%

Ldmos Modeling and High Efficiency Power Amplifier Design Using Pso Algorithm

Jahanbakht¹,

Tondro.Aghmyoni²

2012

PIER M

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Abstract-A simple and nonlinear LDMOS transistor model with multi-bias consideration has been proposed. Elements of the model are optimizes using particle swarm optimization (PSO) algorithm to fit the measured RF specifications of a typical transistor. The developed model is used then to design a high efficiency power amplifier with 55% power added efficiency (PAE) at 33 dBm output power with 12 dB power gain. This amplifier has a novel topology with optimized BALUN and microstrip matching network which makes it unconditionally stable and extensively linear over UHF frequency range of 100 MHz to 1 GHz with 163% fractional bandwidth. This power amplifier is fabricated and realized with 12-V supply voltage. A good agreement between simulated and measured values observed, indicating high accuracy of either the model and the amplifier design approach.

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Power Efficiency and Linearity Enhancement Using Optimized Asymmetrical Doherty Power Amplifiers

Cited by 140 publications

References 21 publications

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

Designing an Octave-Bandwidth Doherty Amplifier Using a Novel Power Combination Method

Ldmos Modeling and High Efficiency Power Amplifier Design Using Pso Algorithm

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