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A highly linearized second harmonic injected GaN power amplifier

This article presents an active second harmonic injection technique for linearizing power amplifiers (PAs). In this method, a second harmonic signal with adjustable amplitude and phase, which is generated by a differential pair network, is injected into the input of a PA in a forward path. The tunab...

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Bibliographic Details
Published in:Microwave and optical technology letters 2022-10, Vol.64 (10), p.1732-1739
Main Authors: Abbasnezhad, F., Tayarani, M., Abrishamifar, A., Nayyeri, V.
Format: Article
Language:English
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Summary:This article presents an active second harmonic injection technique for linearizing power amplifiers (PAs). In this method, a second harmonic signal with adjustable amplitude and phase, which is generated by a differential pair network, is injected into the input of a PA in a forward path. The tunable input and output matching circuits of the proposed second harmonic generator provide linearization capability in a wide frequency band. To validate the concept, the proposed second harmonic injection technique was implemented to linearize a GaN PA working around 1.5 GHz. It was shown that applying the proposed linearization method increases the output 1‐dB compression point from 33.5 dBm to 39.5 dBm (about 2 dB lower than saturation power) under the CW signal. Furthermore, the backed‐off efficiency at a higher adjacent channel power ratio was improved, and improvement of 16 dB at 200 MHz frequency bandwidth was achieved for an 8 MS/s 64‐quadratic‐amplitude modulation signal.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.33360