Linear and Efficient Doherty PA Revisited

Musolff, Christian; Kamper, Michael; Abou-Chahine, Zeid; Fischer, Georg

doi:10.1109/mmm.2013.2288713

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…The 3.5-GHz PA that we showed at the design competition in 2013 produced a two-tone PAE of 62.5%, which corresponded to a CW drain efficiency of ~72% at the end of the linear dynamic range [2]. These results seemed to be very close to the optimum of what can be achieved with the transistors that we used.…”

Section: Christian Musolff Michael Kamper and Georg Fischersupporting

confidence: 66%

“…Ultimately, the increase in the FOM compared with the 3.5-GHz linear DPA of 2013 was only about one point. With further design iterations, an improvement of 2-3% in the PAE might still be possible, but the results presented here and in [2] strongly suggest that this design concept came quite close to its technological limits. …”

Section: Measurement Setup Results and Conclusionmentioning

confidence: 73%

“…Not only does the IMD at backoff stay sufficiently low but the last IMD sweet spot is shifted toward higher power, which significantly increases the peak compression level of the PA and, thus, the peak efficiency. This increase in the peak efficiency is highly valuable in terms of two-tone efficiency due to the distinct shape of the two-tone signal's probability density function (pdf), as described in detail in [2].…”

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confidence: 99%

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Linear Doherty PA at 5 GHz

2015

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Section: Christian Musolff Michael Kamper and Georg Fischersupporting

confidence: 66%

Section: Measurement Setup Results and Conclusionmentioning

confidence: 73%

mentioning

confidence: 99%

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Linear Doherty PA at 5 GHz

2015

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“…First, tuning the quiescent current does not only affect the 3rd-order IMD but also the higher order IMDs. The 5thorder IMD becomes worse if the 3 rd -order IMD improves [8]. This can be seen in Fig.…”

Section: Measured Resultsmentioning

confidence: 80%

A linear high efficiency doherty amplifier with 40 dBm saturated output power using GaN on SiC HEMT devices

Baker

Campbell

2015

2015 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)

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This paper describes the design of a linear high efficiency Doherty power amplifier using TriQuint's 2nd generation Gallium Nitride (GaN) on Silicon Carbide (SiC) T1G6001032-SM. The device was designed for an operating frequency of 3.6 GHz with a 40 dBm saturated output power, and achieves a power added efficiency (PAE) of 60.5% and 52.5% with 6 dB power backed-off (PBO). Advanced Design Systems (ADS) simulation software, in conjunction with Modelithic's active and passive device models, were used throughout the design process and are evaluated against measured results.The use of these device models demonstrates a successful first-pass design, putting less dependence on empirical load-pull analysis, thereby decreasing design-cycle time to market.Index Terms -Doherty, GaN, load modulation, Modelithics, power amplifier, TriQuint.

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“…For example, the efficiency increases form 50 % for class A to 100 % for class F amplifiers at the cost of decrease in linearity [7]. To reduce the effect of linearity while maintaining efficiency different architectures like, Linear Architecture, Power Combiners, Kahn Technique, Envelope Tracking and Doherty Technique have been used [8], [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity effect of Power Amplifiers in wireless communication systems

Yadav

Bera

2014

2014 International Conference on Electronics, Communication and Computational Engineering (ICECCE)

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High Power Amplifier in wireless communication systems exhibit nonlinear behavior which causes signal degradation. This is detrimental to the signals that pass through it. It appears in the form of Harmonic distortion, Gain compression, Inter-modulation distortion, Phase distortion, adjacent channel interference, etc. Orthogonal frequencydivision multiplexing (OFDM) is considered to be better techniques for multicarrier wireless communication. It has tolerance to inter-symbol interference and good spectral efficiency but are subjected to nonlinearities of power amplifiers, due to their high peak-to-average power ratio (PAPR). In this paper, some of the basic PAPR reduction techniques like: Peak clipping, random phase shifting, selected mapping (SLM) and dummy sequence insertion (DSI) methods have been discussed. The results obtained has been compared with original PAPR which suggests improvement in nonlinearity with modest reduction in efficiency and increase in hardware implementations. Among the various techniques SLM method gives low PAPR than other methods.

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Linear and Efficient Doherty PA Revisited

Cited by 14 publications

References 4 publications

Linear Doherty PA at 5 GHz

Linear Doherty PA at 5 GHz

A linear high efficiency doherty amplifier with 40 dBm saturated output power using GaN on SiC HEMT devices

Nonlinearity effect of Power Amplifiers in wireless communication systems

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