A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

Qureshi, Jawad; Pelk, M.; Marchetti, Mauro; Neo, W.C.E.; Gajadharsing, John; Heijden, Mark P. van der; Vreede, L.C.N. de

doi:10.1109/tmtt.2009.2025430

Cited by 116 publications

(65 citation statements)

References 21 publications

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“…14, we obtain the admittance seen by the Class-D PAs, which coincides with the previous works [26], [34] (18) with and The compensation susceptance can be chosen as (19) such that the compensation angle maximizes the average power efficiency for a given modulated transmit signal.…”

Section: Efficiency Of a Class-s Digital Outphasing Transmittersupporting

confidence: 79%

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Concurrent Multiband Digital Outphasing Transmitter Architecture Using Multidimensional Power Coding

Chung

Shinjo

et al. 2015

IEEE Trans. Microwave Theory Techn.

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All-digital outphasing transmitter architecture using multidimensional power coding (MDPC) is proposed for non-contiguous concurrent multiband transmission with a high power efficiency. MDPC transforms multiband digital baseband signals into multi-bit low-resolution digital signals that drive switching-mode PAs. A prototype digital outphasing transmitter consists of two 1-GHz bandwidth GaN Class-D PAs and a Chireix power combiner. The two GaN PAs are driven by bipolar RF PWM signals, which are transformed from a concurrent dual-band LTE signal by MDPC. The dual-band LTE signal with 15-MHz aggregate channel bandwidth at 240 MHz and 500 MHz frequency band is transmitted with -30 dBc and -37 dBc out-of-band emissions, respectively. Digital outphasing achieves more than two times higher coding efficiency than conventional concurrent dual-band digital transmitters with the same PAs in Class-S operation. Measured power coding efficiencies of 35.4% and 47.1% are observed with outphasing bipolar and 3-level RF PWM signals respectively, which are encoded from the dual-band LTE signal. IEEE MTT Transaction, PA Special IssueThis work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved. Index Terms-Class-S power amplifier, concurrent dual-band transmitter, inter-band carrier aggregation, power coding, multiband delta-sigma modulator, outphasing.

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Section: Efficiency Of a Class-s Digital Outphasing Transmittersupporting

confidence: 79%

“…Although ideal Class-D outphasing PAs provide 100% efficiency, non-ideal switch characteristics of transistors degrades the power efficiency. The existing analysis works on Chireix power combiner [26], [33], [34] do not consider these non-idealities at the same time.…”

Section: Efficiency Of a Class-s Digital Outphasing Transmittermentioning

confidence: 99%

Concurrent Multiband Digital Outphasing Transmitter Architecture Using Multidimensional Power Coding

Chung

Shinjo

et al. 2015

IEEE Trans. Microwave Theory Techn.

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“…These loading conditions can help the linearity of the amplifier system, in that if the individual branch amplifiers are prone to AM/AM and AM/PM distortion, the close match between loading conditions means that their behavior will vary together. Referring to the ACLRs achieved by [37], [38], [47] as shown in Table III, we therefore expect that it will be possible to meet the W-CDMA mask requirement using memoryless DPD.…”

Section: Dpd Implementation and Limitationsmentioning

confidence: 99%

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Barton

Perreault

2014

IEEE Trans. Circuits Syst. I

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Abstract-A lossless multi-way outphasing and power combining system for microwave power amplification is presented. The architecture addresses one of the primary drawbacks of Chireix outphasing; namely, the sub-optimal loading conditions for the branch power amplifiers. In the proposed system, four saturated power amplifiers interact through a lossless power combining network to produce nearly resistive load modulation over a 10:1 range of output powers. This work focuses on two microstrip-based power combiner implementations: a hybrid microstrip/discrete implementation using a combination of microstrip transmission line sections with discrete shunt elements, and an all-microstrip implementation incorporating open-circuited radial stubs. We demonstrate and compare these techniques in a 2.14 GHz power amplifier system. With the allmicrostrip implementation, the system demonstrates a peak CW drain efficiency of 70% and drain efficiency of over 60% over a 6.5-dB outphasing output power range with a peak power of over 100 W. We demonstrate W-CDMA modulation with 55.6% average modulated efficiency at 14.1 W average output power for a 9.15-dB peak to average power ratio (PAPR) signal. The performance of this all-microstrip system is compared to that of the proposed hybrid microstrip/discrete version and a previously reported implementation in discrete lumped-element form.Index Terms-base stations, outphasing, power amplifier (PA), wideband code division multiple access (W-CDMA), Chireix, LINC, load modulation.

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“…The EVM increases with increasing bandwidth (signal symbol rate). The limited bandwidth of the OEPAs is both due to 10∼15x bandwidth expansion that comes with the non-linear SCS operation in outphasing mode [34] and due to the limited bandwidth of the output series filter and the combiner. Ways to improve the modulation bandwidth include a lower loaded quality factor for the output filters and using transformer based combiners [35].…”

Section: Vout1mentioning

confidence: 99%

Outphasing Class-E Power Amplifiers: From Theory to Back-Off Efficiency Improvement

Ghahremani

Annema

Nauta

2018

IEEE J. Solid-State Circuits

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Abstract-This paper presents an analysis of outphasing class-E Power Amplifiers (OEPAs), using load-pull analyses of single class-E PAs. This analysis is subsequently used to rotate and shift power contours and rotate the efficiency contours to improve the efficiency of OEPAs at deep power back-off, to improve the Output Power Dynamic Range (OPDR) and to reduce switch voltage stress. To validate the theory a 65nm CMOS prototype, using a pcb transmission-line based power combiner was implemented. The OEPA provides +20.1dBm output power from VDD=1.25V at 1.8GHz with more than 65% Drain Efficiency (DE) and 60% Power Added Efficiency (PAE). The presented technique enables more than 49dB OPDR and 37% DE and 22% PAE at 12dB back-off with reduced switch voltage stress.

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A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

Cited by 116 publications

References 21 publications

Concurrent Multiband Digital Outphasing Transmitter Architecture Using Multidimensional Power Coding

Concurrent Multiband Digital Outphasing Transmitter Architecture Using Multidimensional Power Coding

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Outphasing Class-E Power Amplifiers: From Theory to Back-Off Efficiency Improvement

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