A Mixed-Signal Approach Towards Linear and Efficient $N$-Way Doherty Amplifiers

Neo, W.C.E.; Qureshi, Jawad; Pelk, M.; Gajadharsing, John; Vreede, L.C.N. de

doi:10.1109/tmtt.2007.895160

Cited by 100 publications

(45 citation statements)

References 14 publications

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“…In [92], the HEPR is improved by dynamically adjusting the amplitude and phase of the input signal of the two amplifiers, and three-input versions also exist [93] for further HEPR enhancement. An even signal distribution in the low power region, together with an uneven one in favour of the Auxiliary in the Doherty region, is optimum for linearity and flat-gain response [94], while a frequency-dependent signal decomposition scheme is proposed in [95] to improve DPA bandwidth.…”

Section: Digital/dual-input Dpamentioning

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: Digital/dual-input Dpamentioning

confidence: 99%

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

et al. 2017

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“…5. The carrier power amplifier and the peak power amplifier use the same input/output matching network, and the input power is allocated to the carrier power amplifier and peak power amplifier through equal power allocation such as the Wilkinson power splitters [14].…”

Section: Computing Software Simulationmentioning

confidence: 99%

Application of New Matching Technique in Doherty Amplifier

Chen

Shen

2013

AMM

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According to the shortage of the traditional offset line in Doherty power amplifier, a new offset line technique is proposed to match carrier amplifier with the load and to improve the performance of the Doherty amplifier. By simulation of the computer software, a higher efficiency is obtained using the new offset line comparing the two kinds of offset lines. The new offset line technique could be applied in the system with high linearity and low power operation.

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“…In view of this, when considering the design of the outputpower combining network, it can be proven that for a given position of the high-efficiency power backoff points (e.g., 6 and 12 dB), the linear three-way DPA output combining network [8] requires higher load modulation ratios (a factor of 4 for the main and a factor of 3 for peak1 device), than when using the classical three-way DPA power-combining network (a factor of 2 for the main and 3 for the peak1 device). Based on this observation and the fact that we aim with our design for the highest efficiency possible, we have decided to use the classical three-way DPA concept as a starting point for our design.…”

Section: A Selection Of Output Matching Topologymentioning

confidence: 99%

“…Unfortunately, practical three-way DPA implementations rarely meet their expectations due their complicated implementation. To overcome these implementation issues and enable reproducible, as well as very efficient -way Doherty amplifiers, the use of mixed-signal techniques was recently proposed to establish digital input control of the individual amplifier cells [8]. This approach facilitates the independent optimization of the amplifier-cell drive conditions for maximum efficiency.…”

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confidence: 99%

“…This approach facilitates the independent optimization of the amplifier-cell drive conditions for maximum efficiency. In [8], a prototype three-way Doherty amplifier was demonstrated using 4G NXP LDMOS devices. Up to this date, LDMOS is still the preferred technology for base-station power amplifiers due to its high reproducibility, good power handling, high linearity, and gain, but most importantly, due to its low cost.…”

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A High-Efficiency 100-W GaN Three-Way Doherty Amplifier for Base-Station Applications

Pelk

Neo

Gajadharsing

et al. 2008

IEEE Trans. Microwave Theory Techn.

171

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Abstract-A three-way Doherty 100-W GaN base-station power amplifier at 2.14 GHz is presented. Simple, but accurate design equations for the output power combiner of the amplifier are introduced. Mixed-signal techniques are utilized for uncompromised control of the amplifier stages to optimize efficiency, as well as linearity. The combination of the above techniques resulted in an unprecedented high efficiency over a 12-dB power backoff range, facilitating a record high power-added efficiency for a wideband code division multiple access test signal with high crest factor, while meeting all the spectral requirements for Universal Mobile Telecommunications System base stations.Index Terms-Base station, Doherty, high efficiency, mixed signal, power amplifier, predistortion, Universal Mobile Telecommunications System (UMTS), wideband code division multiple access (W-CDMA).

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A Mixed-Signal Approach Towards Linear and Efficient $N$-Way Doherty Amplifiers

Cited by 100 publications

References 14 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

Application of New Matching Technique in Doherty Amplifier

A High-Efficiency 100-W GaN Three-Way Doherty Amplifier for Base-Station Applications

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