Architecture of Wideband High-Efficiency Envelope Tracking Power Amplifier for Base Station

Kaneta, Masato; Kanbe, Akihiro; Hirata, Hitoshi; Shimura, T.; Yamagishi, Kentarou; Kobayashi, Haruo

doi:10.4028/www.scientific.net/kem.459.241

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…It is commonly approximated that power amplifier uses more than 50% of the whole energy of the base station. With envelope tracking this can be reduced more than 50% [8].…”

Section: Challenges and Approachesmentioning

confidence: 99%

Mobile networks unplugged

Manner

Luoma

Ott

et al. 2010

Proceedings of the 1st International Conference on Energy-Efficient Computing and Networking

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Mobile network access has seemingly become ubiquitous in industrialized countries. With data services becoming sufficiently fast, usable, and affordable, demand is growing rapidly, both in the number of users and in capacity -since most Internet/web resources continue being tailored for fast fixed line access. A lot of engineering has gone into making mobile devices appealing and sufficiently power-conserving to last for at least a day in spite of the many emerging network-driven applications. However, this device-centric view fails to recognize the "other side": the mobile access infrastructure. There, too, power consumption raises technical issues (not just) when moving towards faster mobile access and is de-facto an inhibiting factor for cellular expansion: for practical and for cost reasons. In this paper, we seek to raise awareness of the power consumption issues of mobile networks. We argue that mobile access will become, in addition to data centers and PCs, another contributing factor from the ICT sector to greenhouse gas emissions and that current mobile access technologies limit further network expansion in rural areas. Thus, we need to start working on making mobile networks much more energy-efficient than they are today, maybe even fully selfsustainable using renewable energy sources.

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“…It is commonly approximated that power amplifier uses more than 50% of the whole energy of the base station. With envelope tracking this can be reduced more than 50% [8].…”

Section: Challenges and Approachesmentioning

confidence: 99%

Mobile networks unplugged

Manner

Luoma

Ott

et al. 2010

Proceedings of the 1st International Conference on Energy-Efficient Computing and Networking

View full text Add to dashboard Cite

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“…This kind of complex modulation format generally results in a band limited signal which exhibits time varying envelope (non-constant envelope) and high crest factor (usually 6-10dB [1][2][3][4]). In order to avoid the out-of-channel interference and distortion [5][6][7][8], highly linear radio frequency power amplifiers (RFPAs) are required.…”

Section: Introductionmentioning

confidence: 99%

“…Various techniques have been known in the art for enhancing amplifier efficiency while maintaining high linearity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The supply voltage control schemes are the most potential solutions, of which there are two broad classifications: envelope elimination and restoration (EER) and envelope tracking (ET).…”

Section: Introductionmentioning

confidence: 99%

A novel control method for multilevel converter used inenvelope tracking power supply

Liu

Zhang

2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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The topology of a multilevel converter in series with a linear regulator is a hybrid solution for envelope tracking power supply. A novel control method based on Walsh Transformation of envelope reference was proposed for the multilevel converter. The needed voltage levels for multilevel converter can be derived from the linear combinations of Walsh coefficients and the number of voltage levels can be determined by the order of Walsh basis. The overall power losses of the hybrid topology was analyzed and an algorithm for the optimization of the voltage levels was explained. The proposed control method is simple and can effectively reduce the ratio between the switching frequency and the bandwidth of envelope reference, especially for the periodic signal. A prototype was built for the hybrid solution, which can reproduce any signal with maximum spectral component of 1MHz and give instantaneous maximum power of 50W.

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