Title | ||
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A Design Approach to Maximize the Efficiency vs. Linearity Trade-Off in Fixed and Modulated Load GaN Power Amplifiers. |
Abstract | ||
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This paper proposes a design method to minimize the phase distortion (AM/PM) in gallium nitride (GaN) power amplifiers (PAs) without significantly worsening other key features such as efficiency, amplitude distortion, and gain. The design strategy consists in the adoption of a smart two-stage architecture, in which the driver stage is devised to act as a sort of "analogue AM/PM predistorter" for the final one. Accounting for the actual trend in PA solutions, the proposed approach has been fine-tuned to implement a two-way class AB PA and a Doherty PA (DPA) for backhaul radio links. Both circuits, realized on the same 0.25-mu m GaN technology and in monolithic form, have fully been characterized with continuous wave and modulated signals. At 7 GHz, the DPA shows 38 dBm of saturated output power and less than 3 degrees of phase distortion with a power-added efficiency (PAE) higher than 41% in 6 dB of power back off. The class AB PA achieves almost the same level of saturated output power and maximum PAE, with an inevitable lower efficiency in back-off operation, whereas the registered AM/PM is lower than 1.5 degrees. Moreover, when tested with modulated signals, at 32 dBm of average output power and without any digital predistortion, the DPA shows a spectral regrowth of around 36 dBc and a PAE of 40%, whereas the class AB PA achieves 40 dBc and 30%, respectively. |
Year | DOI | Venue |
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2018 | 10.1109/ACCESS.2018.2807479 | IEEE ACCESS |
Keywords | Field | DocType |
GaN class AB PA,DPA,linearity,AM/ PM,efficiency | Gallium nitride,Amplitude distortion,Computer science,Linearity,Computer network,Phase distortion,dBc,Nonlinear distortion,Electrical engineering,Predistortion,Amplifier | Journal |
Volume | ISSN | Citations |
6 | 2169-3536 | 0 |
PageRank | References | Authors |
0.34 | 0 | 3 |
Name | Order | Citations | PageRank |
---|---|---|---|
rocco giofre | 1 | 1 | 2.85 |
paolo colantonio | 2 | 1 | 1.16 |
Franco Giannini | 3 | 2 | 2.42 |