Transmission-line-based multi-way lossless power combining and outphasing system

Barton, Taylor W.; Jurkov, Alexander S.; Perreault, David J.

doi:10.1109/mwsym.2014.6848256

Cited by 12 publications

(27 citation statements)

References 9 publications

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“…The proposed approach shares the benefits of power combining techniques based on nonisolating transmission-line combiners [20], [26], [44], [45] while significantly reducing the reactive loading of the power amplifiers. This paper expands on the preliminary demonstration of this approach in the authors' conference paper [46] with a complete theoretical analysis of the transmission-line combining network. This work introduces the derivation of the input-port admittance characteristics and outphasing control strategies.…”

Section: Introductionmentioning

confidence: 83%

“…(Note that the related conference paper [46] indicated values ∆ 1 = 0.201λ and ∆ 2 = 0.196λ in error; the lengths ∆ 1 = 0.049λ and ∆ 2 = 0.054λ were used.) A quarter-wave transformer with Z T = 40.8 Ω functions as an impedance transformer between the R L = 33 Ω design resistance and the actual R L0 = 50 Ω load.…”

Section: B Experimental Prototype Layoutmentioning

confidence: 99%

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Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner

Barton

Jurkov

Pednekar

et al. 2016

IEEE Trans. Microwave Theory Techn.

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Abstract-A lossless power combining network comprising cascaded transmission line segments in a tree structure is introduced for a multi-way outphasing architecture. This architecture addresses the suboptimal loading conditions in Chireix outphasing transmitters while offering a compact and microwavefriendly implementation compared to previous techniques. In the proposed system, four saturated power amplifiers interact through an all-transmission-line power combining network to produce nearly ideal resistive load modulation of the branch power amplifiers over a 10:1 range of output powers. This work focuses on the operation of the combining network, deriving analytical expressions for input-port admittance characteristics and an outphasing control strategy to modulate output power while minimizing reactive loading of the saturated branch amplifiers. A methodology for combiner design is given, along with a combiner design example for compact layout. An experimental four-way outphasing amplifier system operating at 2.14 GHz demonstrates the technique with greater than 60% drain efficiency for an output power range of 6.2 dB. The system demonstrates a W-CDMA modulated signal with a 9.15-dB peak to average power ratio (PAPR) with 54.5% average modulated efficiency at 41.1 dBm average output power.Index Terms-base stations, outphasing, power amplifier (PA), wideband code division multiple access (W-CDMA), Chireix, LINC, load modulation.

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Section: Introductionmentioning

confidence: 83%

Section: B Experimental Prototype Layoutmentioning

confidence: 99%

Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner

Barton

Jurkov

Pednekar

et al. 2016

IEEE Trans. Microwave Theory Techn.

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“…The implementation described in this work and used for the experimental prototype is based on an all-transmissionline approach as described for the power combining system in [10], and for resistance compression networks (RCNs) in [27], but we note that versions are also possible using discrete components, microstrip techniques, or a combination of those, related to the lumped-element [7], [8], microstrip with shunt reactive element [9], and all-transmission-line [10] variations of the four-way outphasing power combiner. Likewise, the approaches described in this work may be applied two-way (Chireix) outphasing, including its relatively wideband variations [4], [5].…”

Section: A Conceptual Overviewmentioning

confidence: 99%

“…4. An analogous inverse-RCN approach can be seen in the relationship between the transmission-line combining network [10] and transmissionline resistance compression network (TLRCN) [27]. As described in detail in [27], a TLRCN may be constructed as a binary tree of transmission-line sections, with the two branch lengths at the nth branch point a deviation ±∆ n from a base length (typically λ/2 or λ/4).…”

Section: B Outphasing Operationmentioning

confidence: 99%

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Theory and Implementation of RF-Input <newline/>Outphasing Power Amplification

Barton

Perreault

2015

IEEE Trans. Microwave Theory Techn.

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Abstract-Conventional outphasing power amplifier systems require both an RF carrier input and a separate baseband input to synthesize a modulated RF output. This work presents an RF-input / RF-output outphasing power amplifier that directly amplifies a modulated RF input, eliminating the need for multiple costly IQ modulators and baseband signal component separation as in previous outphasing systems. An RF signal decomposition network directly synthesizes the phase-and amplitude-modulated signals used to drive the branch PAs. With this approach, a modulated RF signal including zero-crossings can be applied to the single RF input port of the outphasing RF amplifier system. The proposed technique is demonstrated at 2.14 GHz in a fourway lossless outphasing amplifier with transmission-line power combiner. The RF decomposition network is implemented using a transmission-line resistance compression network with nonlinear loads designed to provide the necessary amplitude and phase decomposition. The resulting proof-of-concept outphasing power amplifier has a peak CW output power of 93 W, peak drain efficiency of 70%, and performance on par with a previouslydemonstrated outphasing and power combining system requiring four IQ modulators and a digital signal component separator.

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Efficiency First: Outphasing Architectures for Power Amplification of High-PAPR Signals

Barton

2015

2015 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)

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Transmission-line-based multi-way lossless power combining and outphasing system

Cited by 12 publications

References 9 publications

Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner

Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner

Theory and Implementation of RF-Input <newline/>Outphasing Power Amplification

Efficiency First: Outphasing Architectures for Power Amplification of High-PAPR Signals

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