LINC power amplifier combiner method efficiency optimization

Stengel, B.; Eisenstadt, W.R.

doi:10.1109/25.820715

Cited by 57 publications

(17 citation statements)

References 12 publications

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“…Finally, the combined signal is transmitted through an antenna. As illustrated in [16]- [18], the power-combiner circuit is one big contributor to the efficiency of the LINC system, and the loss introduced in it will significantly affect the efficiency.…”

Section: Theory and Designmentioning

confidence: 99%

Integrated antenna/power combiner for LINC radio transmitters

Gao

Gardner

2005

IEEE Trans. Microwave Theory Techn.

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This paper presents integrated antennas, which can fulfill both the functions of an antenna and a power combiner, thus reducing the circuit loss. This will be useful for linear amplification using nonlinear components systems, where the circuit-level power-combiner losses degrade overall efficiency. Two antennas, which use a single-layer structure and a multilayer structure, respectively, are designed. Both antennas achieve good impedance-matching characteristics under both even-and odd-mode excitations. The single-layer antenna has a narrow bandwidth, and the even-mode radiated power at boresight is 33 and 26 dB lower than that of the odd-mode radiated power at the -and -plane, respectively, thus demonstrating the effective suppression of even-mode radiation. The other antenna using multilayer structure achieves a broad-band bandwidth ( 11 10 dB) of 15.5% and 8% under the odd-and even-mode excitation, respectively. Across the bandwidth, broadside radiation patterns with low cross-polar levels ( 21 dB) are achieved under the odd-mode excitation, while the even-mode radiation is also suppressed.

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Section: Theory and Designmentioning

confidence: 99%

Integrated antenna/power combiner for LINC radio transmitters

Gao

Gardner

2005

IEEE Trans. Microwave Theory Techn.

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“…Therefore, it is important to understand and verify experimentally the effect of load modulation on the efficiency and power of each PA. Analyses leading to the design of non-isolated combiners in [5]- [7] Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

X-Band outphasing power amplifier with internal load modulation measurements

Litchfield¹,

Reveyrand²,

Popović³

2014

2014 44th European Microwave Conference

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Abstract-This paper presents a general measurement based design method for outphasing amplifiers. Both isolated and nonisolated combiners are designed based on individual PA loadpull measurements, in order to load modulate two 0.15µm GaN MMIC power amplifiers at 10.1 GHz. Load modulation measurements are performed at ports internal to the PA, with the inclusion of couplers in the combiner and a four-port LSNA, to gain insight into the dynamics of load modulation during outphasing operation. Both outphasing systems exhibit a peak PAE greater than 41.5 % at a peak output power greater than 35.7 dBm.

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“…When the Chireix technique, which uses a lossless combiner, is considered, an improvement in the combiner efficiency is observed. However this is obtained at the cost of linearity degradation [3], [4]. In [5] analytical expressions were derived for the output signals and the efficiency of Chireix combiners.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Efficiency vs. Linearity Trade-offs in LINC Amplifiers for Varying Outphasing Combiner Reactances

Hamdane

El-Asmar

Birafane

et al. 2007

2007 14th IEEE International Conference on Electronics, Circuits and Systems

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This paper presents an investigation of the trade-offs between efficiency improvement and linearity of the outphasing power amplifier. Simulations are carried out using realistic component models with ADS software to validate the theoretical analysis. Two types of digital modulation signals are used, namely 16QAM and 64QAM. The impact of the stub length on the efficiency and linearity is studied for both signals. The work shows that a trade-off can be made between efficiency and linearity, as measured by the error vector magnitude (EVM) and the adjacent channel interference (ACI), for a given signal by proper choice of the outphasing combiner's reactances. The resulting combiner ensures signal transmission with the maximum efficiency that meets the established linearity requirement.

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LINC power amplifier combiner method efficiency optimization

Cited by 57 publications

References 12 publications

Integrated antenna/power combiner for LINC radio transmitters

Integrated antenna/power combiner for LINC radio transmitters

X-Band outphasing power amplifier with internal load modulation measurements

Investigation of Efficiency vs. Linearity Trade-offs in LINC Amplifiers for Varying Outphasing Combiner Reactances

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