A 1.8-3.8-GHz Power Amplifier With 40% Efficiency at 8-dB Power Back-Off
| Autor: | Bo Berglund, Paul Saad, Rui Hou, Richard Hellberg |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Radiation
Computer science Orthogonal frequency-division multiplexing business.industry Amplifier 020208 electrical & electronic engineering dBm Bandwidth (signal processing) Electrical engineering 020206 networking & telecommunications 02 engineering and technology Condensed Matter Physics Electricity generation Broadband 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Wideband business Electrical impedance |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. :1-13 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2018.2867426 |
| Popis: | This paper presents a novel power combining architecture, referred to as distributed efficient power amplifier (DEPA) that mitigates the inherent bandwidth limiting factors in a Doherty power amplifier (DPA), namely, impedance inversion and load modulation, by distributing the conventional auxiliary amplifier of the DPA to multiple auxiliary subamplifiers along a broadband multisection impedance transformer. The proposed technique is demonstrated through the design, implementation, and measurement of a wideband DEPA having 8-dB output power back-off and 72% fractional bandwidth. The experimental results show a Doherty-like efficiency enhancement from 1.8 to 3.8 GHz. For the output power levels of 37.4±1.1 and 45.4±1.1 dBm, corresponding to 8-dB OBO and peak output power, the efficiency levels are between 41%–51% and 42%–62%, respectively. Furthermore, linearized modulated measurements show that the DEPA is linearizable and meets the spectral requirements for modern wireless communication systems. |
| Databáze: | OpenAIRE |
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