Loading…
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...
Saved in:
Published in: | Microwave and optical technology letters 2022-10, Vol.64 (10), p.1732-1739 |
---|---|
Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
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 |