Experimental system level analysis of a concurrent dual-band power amplifier for WiMAX and WCDMA applications

Cidronali, Alessandro; Magrini, I.; Giovannelli, Niccolò; Mercanti, Massimiliano; Manes, G.

doi:10.1017/s1759078709000063

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…The main objective of this paragraph is about the consistent and quantitative evaluation of a two possible architectures of dual-band PA both suitable for their involvement in the concurrent dual-band systems, [12]. The first is based on two dedicated PAs combined by a frequency diplexer while the second is specifically designed to be operated in dual-band state.…”

Section: Dual-band Power Amplifier Architecturesmentioning

confidence: 99%

Flexible Power Amplifier Architectures for Spectrum Efficient Wireless Applications

Cidronali¹,

Magrini²,

Manes³

2010

Advanced Microwave Circuits and Systems

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Section: Dual-band Power Amplifier Architecturesmentioning

confidence: 99%

Flexible Power Amplifier Architectures for Spectrum Efficient Wireless Applications

Cidronali¹,

Magrini²,

Manes³

2010

Advanced Microwave Circuits and Systems

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“…To accommodate higher data rates, significant efforts have been made to design multiband transmitters to support multiple standards in different frequency bands. More specifically, dual-band radiofrequency (RF) power amplifiers (PAs) that can accommodate signals in two different frequency bands have been successfully designed and tested [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

2D Extended envelope memory polynomial model for concurrent dual-band RF transmitters

Amin

Landin

Händel

et al. 2017

Int. J. Microw. Wireless Technol.

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The paper presents a two-dimensional (2D) extended envelope memory polynomial model for concurrent dual-band radio frequency (RF) power amplifiers (PAs). The model is derived based on the physical knowledge of a dual-band RF PA. The derived model contains cross-modulation terms not included in previously published models; these terms are found to be of importance for both behavioral modeling and digital predistortion (DPD). The performance of the derived model is evaluated both as the behavioral model and DPD, and the performance is compared with state-of-the-art 2D-DPD and dual-band generalized memory polynomial (DB-GMP) models. Experimental result shows that the proposed model resulted in normalized mean square error of 251.7/251.6 dB and adjacent channel error power ratio of 263.1/263.4 dB, for channel 1/2, whereas the 2D-DPD resulted in the largest model error and DB-GMP resulted in model parameters that are three times more than those resulted with the proposed model with the same performance. As pre-distorter, the proposed model resulted in adjacent channel power ratio of 255.8/254.6 dB for channel 1/2 and is 7-10 dB lower than those resulted with the 2D-DPD model and 2-4 dB lower compared with the DB-GMP model. I . I N T R O D U C T I O NGrowing demand for higher data rates along with the global concern on green technologies places challenging requirements on wireless transmitters. To accommodate higher data rates, significant efforts have been made to design multiband transmitters to support multiple standards in different frequency bands. More specifically, dual-band radiofrequency (RF) power amplifiers (PAs) that can accommodate signals in two different frequency bands have been successfully designed and tested [1][2][3].The non-linear behavior of RF PAs in the transmitter chain causes well-known hardware impairments. The non-linear distortion, which typically is dynamic, contains both in-band distortion and spectral regrowth, i.e. spectral spreading into the adjacent bands, thus interfering with signals in these channels. There are numerous publications on the linearization and efficiency improvement of single-input-singleoutput (SISO) RF PAs [4][5][6]. Digital predistortion (DPD) is a well-known technique and is applied to compensate PA nonlinear behavior and to improve the overall power efficiency of the RF transmitters. In DPD, an inverse mathematical model of the PA is used and put upstream of the PA to produce a linear output signal. Thus, an accurate mathematical model is required for the linearization of RF PAs.When dealing with the concurrent dual-band RF PAs, SISO DPD methods cannot be used, since there are two input and two output signals. In multi-band PAs, the nonlinear distortions are classified as in-band and cross-band distortions [7][8][9][10]. Both these distortion types should be included in behavioral models and DPD techniques for modeling and linearizing concurrent multi-band PAs.In recent years, several techniques have been proposed to compensate the non-linear distortions in con...

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“…While the problem of the energy efficiency with wide dynamic range signals and the operation at multiple frequency bands are addressed separately by several design techniques, [1]- [3], this paper addresses both the issues through the design of a dual-band envelope tracking (ET) PA as a response to the increasing need of energy and spectral efficiency. The most straightforward multi-band design approach considers multiple PAs, one for each operating frequency, though this approach is limited by the power losses introduced by the power combiners [4]. Furthermore this approach becomes cumbersome when thought in the contest of an ET system, which is one of the main PA architectures enabling the design of high efficiency PAs for wide dynamic range signals.…”

Section: Introductionmentioning

confidence: 99%

A concurrent dual band 870 and 1970 MHz 10 W envelope tracking PA designed by a WCDMA probability distribution conscious approach

Giovannelli

Cidronali

Manes

2011

2011 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications

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In this paper we propose a novel approach for the design of a concurrent dual-band power amplifier (PA) optimized for envelope tracking (ET) operation. The design was based around the WCDMA probability distribution function and implemented through a multi-section transmission line matching technique. This technique was applied to a concurrent 870 and 1970 MHz ET PA designed around a GaAs HEMT. The ET friendly design method has proven capable to enhance the average efficiency by a 2.2 factor over a signal bandwidth of 140MHz and 60MHz in the two carrier frequency bands respectively for the specific WCDMA signal. A detailed discussion of the design method and the validating experimental results are reported.Index Terms -multi-band PA, GaAs Envelope Tracking PA.

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Experimental system level analysis of a concurrent dual-band power amplifier for WiMAX and WCDMA applications

Cited by 8 publications

References 8 publications

Flexible Power Amplifier Architectures for Spectrum Efficient Wireless Applications

Flexible Power Amplifier Architectures for Spectrum Efficient Wireless Applications

2D Extended envelope memory polynomial model for concurrent dual-band RF transmitters

A concurrent dual band 870 and 1970 MHz 10 W envelope tracking PA designed by a WCDMA probability distribution conscious approach

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