CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers
The second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In a recent paper, a drain efficiency enhancement for a continuous-mode power amplifiers was reported to be achieved using active broadband second-harmonic injection at the PA input. In this paper,...
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MDPI AG
2021-10-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/10/20/2507 |
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| author | Hsiu-Chen Chang Patrick Roblin Yunsik Hahn Jose I. Martinez-Lopez Chenyu Liang |
| author_facet | Hsiu-Chen Chang Patrick Roblin Yunsik Hahn Jose I. Martinez-Lopez Chenyu Liang |
| author_sort | Hsiu-Chen Chang |
| collection | DOAJ |
| description | The second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In a recent paper, a drain efficiency enhancement for a continuous-mode power amplifiers was reported to be achieved using active broadband second-harmonic injection at the PA input. In this paper, the strategy for selecting the second-harmonic input impedance and the necessity for using active injection in such broadband PAs are discussed in detail. Additionally, the methodology for designing an embedded broadband diplexer in the input matching network is reported. Finally, the importance of the phase of the second-harmonic signal injected is demonstrated for both CW and modulated signals using both simulation and measurement, respectively. The effectiveness of the CW and modulated active second-harmonic injection methodology presented here are validated by previously reported measurements that demonstrated an average drain efficiency improvement of 9.4% from 1.3 to 2.4 GHz for CW signals and of 9.7% at 2 GHz for a frequency-modulated 30 MHz chirp radar signal. |
| first_indexed | 2024-03-10T06:37:04Z |
| format | Article |
| id | doaj.art-dfb3bb2b89a04b999fa58f8c569b47c3 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T06:37:04Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-dfb3bb2b89a04b999fa58f8c569b47c32023-11-22T18:02:19ZengMDPI AGElectronics2079-92922021-10-011020250710.3390/electronics10202507CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power AmplifiersHsiu-Chen Chang0Patrick Roblin1Yunsik Hahn2Jose I. Martinez-Lopez3Chenyu Liang4Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USADepartment of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USADepartment of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USADivisión de Ingeniería Eléctrica, Universidad Nacional Autonoma de México, Mexico City 04510, MexicoDepartment of Electrical and Computer Engineering, The Ohio State University, Columbus, OH 43210, USAThe second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In a recent paper, a drain efficiency enhancement for a continuous-mode power amplifiers was reported to be achieved using active broadband second-harmonic injection at the PA input. In this paper, the strategy for selecting the second-harmonic input impedance and the necessity for using active injection in such broadband PAs are discussed in detail. Additionally, the methodology for designing an embedded broadband diplexer in the input matching network is reported. Finally, the importance of the phase of the second-harmonic signal injected is demonstrated for both CW and modulated signals using both simulation and measurement, respectively. The effectiveness of the CW and modulated active second-harmonic injection methodology presented here are validated by previously reported measurements that demonstrated an average drain efficiency improvement of 9.4% from 1.3 to 2.4 GHz for CW signals and of 9.7% at 2 GHz for a frequency-modulated 30 MHz chirp radar signal.https://www.mdpi.com/2079-9292/10/20/2507broadband power amplifierbroadband diplexerefficiency enhancementinput second-harmonic injection |
| spellingShingle | Hsiu-Chen Chang Patrick Roblin Yunsik Hahn Jose I. Martinez-Lopez Chenyu Liang CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers Electronics broadband power amplifier broadband diplexer efficiency enhancement input second-harmonic injection |
| title | CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers |
| title_full | CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers |
| title_fullStr | CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers |
| title_full_unstemmed | CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers |
| title_short | CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers |
| title_sort | cw and modulated input second harmonic injection for efficiency enhancement in broadband power amplifiers |
| topic | broadband power amplifier broadband diplexer efficiency enhancement input second-harmonic injection |
| url | https://www.mdpi.com/2079-9292/10/20/2507 |
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