Design of Varactor-Based Tunable Matching Networks for Dynamic Load Modulation of High Power Amplifiers

Nemati, Hossein Mashad; Fager, Christian; Gustavsson, Ulf; Jos, Rik; Zirath, Herbert

doi:10.1109/tmtt.2009.2017257

Cited by 135 publications

(95 citation statements)

References 9 publications

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“…Given a desired output signal, the efficiency-optimized co-control of the baseband control voltage, v c , and the RF input signal, x, can be derived from a single-input-dual-output polynomial fitting model [8]. The model is constructed from static measurements at which all combinations of the two input signals for a given desired output signal are first recorded, and only the combination which gives the highest efficiency is then selected [9]. The efficiency-optimized relationship of the desired output signal and the two input signals is shown in Fig.…”

Section: A Background For Dynamic Load Modulation Pa Architecturementioning

confidence: 99%

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Cao

Fager

Khan

et al. 2011

2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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Abstract-This paper compares bandwidth reduction schemes for baseband control signals used in high efficiency power amplifier (PA) architectures, such as envelope tracking and dynamic load modulation (DLM). The baseband control signal used in such architectures usually has 3-4 times wider bandwidth than the modulated radio frequency (RF) signal. Such a wideband signal brings challenges for practical hardware design. In this paper, two bandwidth reduction schemes originally used in envelope tracking are applied on a DLM PA. The performance of both schemes are investigated by simulation. The results show that the bandwidth of the baseband control signal can be effectively reduced from 12.5 MHz to 4 MHz, while at the same time, maintaining a 49% average power-added and acceptable linearity.

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Section: A Background For Dynamic Load Modulation Pa Architecturementioning

confidence: 99%

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Cao

Fager

Khan

et al. 2011

2011 Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits

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show abstract

“…The DLM architecture, in fact, can be implemented at the system-level, by following a modular approach, where the tunable filter is added externally to an already existent amplifier [124,125]. However, in [126][127][128], it is shown how an integrated approach, where the tunable elements are designed within the output matching network of the PA, can further improve the achievable bandwidth and efficiency.…”

Section: Dynamic Load Modulationmentioning

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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“…At the heart of such systems, are tunable circuits like filters, antennas, and matching networks (MN). The latter are important to design power amplifiers [1] and antennas [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the coverage of tunable matching networks with three tunable elements

Arabi

Jiao

Morris

et al. 2017

2017 IEEE MTT-S International Microwave Symposium (IMS)

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Design of Varactor-Based Tunable Matching Networks for Dynamic Load Modulation of High Power Amplifiers

Cited by 135 publications

References 9 publications

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

Comparison of bandwidth reduction schemes in dynamic load modulation power amplifier architectures

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

Analysis of the coverage of tunable matching networks with three tunable elements

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