Design and performance of sequential power amplifiers

Lehmann, Thomas; Knoechel, R.

doi:10.1109/mwsym.2008.4632945

Cited by 18 publications

(26 citation statements)

References 3 publications

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“…At 0dB back-off the efficiency varies between 76% and 70%, depending on the OPCR. Comparison with results published earlier [4] shows a significant efficiency improvement of up to 25% at low back-off. Fig.…”

Section: Efficiency Calculations and Network Parameterssupporting

confidence: 67%

“…The combination of power in the SPA concept with an ordinary quadrature coupler is a nonlinear process [4]. The utilization of a combining directional coupler with variable coupling ratio leads to additional nonlinearity.…”

Section: Sequential Power Amplifier Designmentioning

confidence: 99%

“…As an alternative, sequential power amplifiers (SPAs) [3,4], also offering efficiency enhancement using main and auxiliary amplifiers, potentially permit simple design and wideband operation. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…It was further examined and experimentally investigated in [4], where also a switched coupler as the combiner was introduced. This paper will first discuss theoretical limits and potentials of the SPA concept.…”

Section: Introductionmentioning

confidence: 99%

“…OPTIMAL POWER COMBINER SPAs described earlier [4,6] were built up with ordinary directional couplers which can be represented by the generic coupler of fig.3. The output wave b 2 is the desired signal.…”

Section: Introductionmentioning

confidence: 99%

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Sequential power amplifiers with adaptable combiners

Lehmann¹,

Knoechel²

2009

2009 IEEE MTT-S International Microwave Symposium Digest

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This paper discusses design aspects of sequential power amplifiers (SPAs). After derivation of theoretical performance limits, an optimum practical realisation is suggested, using an FPGA-circuit at the input and an adaptable directional coupler as the signal combiner at the output. Design trade-offs between the optimum coupling and the output power capability of the involved amplifiers are outlined. Using SPAs efficiencies of more than 50% can be achieved under up 10dB back-off from maximum power. The combining characteristics of the adaptable combiner are investigated. Off-the-shelf power amplifiers may be employed, which can be linearized in a conventional manner. The paper closes with measurement results.

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Section: Efficiency Calculations and Network Parameterssupporting

confidence: 67%

Section: Sequential Power Amplifier Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sequential power amplifiers with adaptable combiners

Lehmann¹,

Knoechel²

2009

2009 IEEE MTT-S International Microwave Symposium Digest

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Design of a tunable sequential power amplifier

Shao

Ren

Zhou

et al. 2015

Micro & Optical Tech Letters

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A tunable sequential power amplifier (SPA) is presented in this article. The proposed SPA, including a tunable coupler, a carrier amplifier, a peaking amplifier, and a combining coupler is fabricated on Isola I-TeraMTRF boards with 3.45 dielectric constant and 0.508 mm substrate thickness. A conventional SPA (nontunable) is also designed for reference and performance comparison. Measurement results show that the tunable SPA provides about 2 dB higher gain and 1 dB higher power output comparing with the reference design. The measurement results match well with the analysis.

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Design of a dual-band sequential power amplifier

Shao

Ren

Zhou

et al. 2015

Microw. Opt. Technol. Lett.

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In this article, we present a dual‐band sequential power amplifier (SPA) to provide high efficiency at power back‐offs and maximum output power at two separate working frequencies. The proposed SPA, including a carrier amplifier, a peaking amplifier, a power divider, and a combing coupler, is fabricated on Isola I‐TeraMTRF boards with 3.45 dielectric constant, 0.0028 loss tangent, and 0.508 mm substrate thickness. The SPA provides 48 and 62% drain efficiency (DE) at 6 dB output back‐ off (OBO) and maximum output power at 1.1 GHz (first design frequency), and it also provides 52 and 65% DE at 6 dB OBO and maximum output power at 1.5 GHz (second design frequency). The designed SPA achieves above 39 dBm output powers at two working frequencies with about 10 dB gain and ±1.3 dB gain flatness. To the best of the authors’ knowledge, it is the first time that a dual‐band SPA is reported and demonstrated experimentally. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:99–102, 2016

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Design and performance of sequential power amplifiers

Cited by 18 publications

References 3 publications

Sequential power amplifiers with adaptable combiners

Sequential power amplifiers with adaptable combiners

Design of a tunable sequential power amplifier

Design of a dual-band sequential power amplifier

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