An Improved Power-Added Efficiency 19-dBm Hybrid Envelope Elimination and Restoration Power Amplifier for 802.11g WLAN Applications

Wang, Feipeng; Kimball, D.; Popp, J.D.; Yang, A.T.; Lie, Donald Y. C.; Asbeck, P.M.; Larson, L.E.

doi:10.1109/tmtt.2006.885575

Cited by 272 publications

(108 citation statements)

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“…One of the most well-known polar schemes is Envelope Elimination and Restoration (EER), brought to attention by Khan (Khan, 1952;Wang et al, 2006;Su & McFarland, 1998). The envelope is used to control the PA supply level, while the phase signal is upconverted to RF and transformed to a constant envelope signal, driving the PA input.…”

Section: Supply Variationmentioning

confidence: 99%

“…One of the main advantages is that the bandwidth of the PA input signal is not expanded, but a linear amplifier generally has a lower efficiency than a SM amplifier. However, requirements on the envelope signal and timing are less stringent (Wang et al, 2006). So-called hybrid EER architectures have been demonstrated, where the ET linear amplifier is replaced by a SM amplifier, however, still driven by the full Cartesian RF signal (Wang et al, 2006).…”

Section: Supply Variationmentioning

confidence: 99%

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CMOS Integrated Switched-Mode Transmitters for Wireless Communication

Cijvat¹

2010

Advances in Solid State Circuit Technologies

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Section: Supply Variationmentioning

confidence: 99%

Section: Supply Variationmentioning

confidence: 99%

CMOS Integrated Switched-Mode Transmitters for Wireless Communication

Cijvat¹

2010

Advances in Solid State Circuit Technologies

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“…The efficiency around the average output power level has been enhanced by the introduction of several efficiency enhancement techniques have been introduced, such as envelope elimination and restoration (EER), envelope tracking (ET), and Doherty power amplifier (DPA) techniques [1][2][3][4]. Among these techniques, DPA, which employs a load impedance modulation technique, has been widely used in the base station due to its simple structure and high efficiency at the average output power region.…”

Section: Introductionmentioning

confidence: 99%

Highly Linear 2-Stage Doherty Power Amplifier Using GaN MMIC

Jee¹,

Lee²,

Kim³

et al. 2014

Journal of electromagnetic engineering and science

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A power amplifier (PA) for a femto-cell base station should be highly efficient, linear and small. The efficiency for amplification of a high peak-to-average power ratio (PAPR) signal was improved by designing an asymmetric Doherty PA (DPA). The linearity was improved by applying third-order inter-modulation (IM3) cancellation method. A small size is achieved by designing the DPA using GaN MMIC process. The implemented 2-stage DPA delivers a power-added efficiency (PAE) of 38.6% and a gain of 33.4 dB with an average power of 34.2 dBm for a 7.2 dB PAPR 10 MHz bandwidth LTE signal at 2.14 GHz. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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“…Efficient supply modulation is also reported for a hybrid polar and envelope tracking amplifiers [7], but the spectral mask compliance is unclear. The major requirements of the supply modulator used in a polar modulation architecture are large bandwidth, low switching ripple and small differential delay between envelope and phase paths.…”

Section: Introductionmentioning

confidence: 99%