Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range
This paper presents a generalized expression of the modified load networks (MLNs) for Doherty power amplifiers (DPAs) with an extended output power back-off (OBO) range. Based on the analysis using this new expression, a new circuit structure generally applicable to any combination of the multiple M...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9837065/ |
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| author | Yifei Chen Woojin Choi Jaekyung Shin Hyeongjin Jeon Sooncheol Bae Young Chan Choi Seungmin Woo Young Yun Woo Hansik Oh Kang-Yoon Lee Keum Cheol Hwang Youngoo Yang |
| author_facet | Yifei Chen Woojin Choi Jaekyung Shin Hyeongjin Jeon Sooncheol Bae Young Chan Choi Seungmin Woo Young Yun Woo Hansik Oh Kang-Yoon Lee Keum Cheol Hwang Youngoo Yang |
| author_sort | Yifei Chen |
| collection | DOAJ |
| description | This paper presents a generalized expression of the modified load networks (MLNs) for Doherty power amplifiers (DPAs) with an extended output power back-off (OBO) range. Based on the analysis using this new expression, a new circuit structure generally applicable to any combination of the multiple MLNs is proposed. The load network has a simple structure including impedance matching circuits and offset lines for the carrier and peaking amplifiers. A design procedure for the proposed load network is presented. A DPA using any optimized combination of the multiple MLNs can be easily designed using the proposed load network. For verification, a GaN-HEMT symmetrical DPA based on a combination of the virtual open-stub (VOS) and out-phased current combining (OCC) methods was designed and implemented for the frequency band of 3.4 - 3.7 GHz. The reversed uneven power splitting method is adopted in the design for higher power gain. Using the 5G New Radio (NR) signal with a peak-to average power ratio (PAPR) of 7.9 dB and a signal bandwidth of 100 MHz, the proposed DPA exhibited DE of 55.3 - 60.9% with a power gain of 11.9 - 12.7 dB at an average output power of 33.7 dBm. An adjacent channel leakage power ratio (ACLR) of −42.6 - −44.8 dBc was achieved at the average power level by using a digital predistortion (DPD) technique across the band. |
| first_indexed | 2024-04-13T19:04:02Z |
| format | Article |
| id | doaj.art-cf05fa74105c4fc1b4898f927811ee14 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-04-13T19:04:02Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-cf05fa74105c4fc1b4898f927811ee142022-12-22T02:34:01ZengIEEEIEEE Access2169-35362022-01-0110774877749710.1109/ACCESS.2022.31932279837065Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off RangeYifei Chen0Woojin Choi1https://orcid.org/0000-0003-4365-1519Jaekyung Shin2https://orcid.org/0000-0003-4790-0156Hyeongjin Jeon3Sooncheol Bae4https://orcid.org/0000-0001-7905-3196Young Chan Choi5https://orcid.org/0000-0002-4510-4685Seungmin Woo6Young Yun Woo7Hansik Oh8Kang-Yoon Lee9https://orcid.org/0000-0001-9777-6953Keum Cheol Hwang10https://orcid.org/0000-0002-8074-1137Youngoo Yang11https://orcid.org/0000-0003-3463-0687Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaSamsung Electronics Company Ltd., Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaDepartment of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South KoreaThis paper presents a generalized expression of the modified load networks (MLNs) for Doherty power amplifiers (DPAs) with an extended output power back-off (OBO) range. Based on the analysis using this new expression, a new circuit structure generally applicable to any combination of the multiple MLNs is proposed. The load network has a simple structure including impedance matching circuits and offset lines for the carrier and peaking amplifiers. A design procedure for the proposed load network is presented. A DPA using any optimized combination of the multiple MLNs can be easily designed using the proposed load network. For verification, a GaN-HEMT symmetrical DPA based on a combination of the virtual open-stub (VOS) and out-phased current combining (OCC) methods was designed and implemented for the frequency band of 3.4 - 3.7 GHz. The reversed uneven power splitting method is adopted in the design for higher power gain. Using the 5G New Radio (NR) signal with a peak-to average power ratio (PAPR) of 7.9 dB and a signal bandwidth of 100 MHz, the proposed DPA exhibited DE of 55.3 - 60.9% with a power gain of 11.9 - 12.7 dB at an average output power of 33.7 dBm. An adjacent channel leakage power ratio (ACLR) of −42.6 - −44.8 dBc was achieved at the average power level by using a digital predistortion (DPD) technique across the band.https://ieeexplore.ieee.org/document/9837065/Doherty power amplifierextended output power back-offmodified load networkvirtual open stubout-phased current combiningcomplex combining load |
| spellingShingle | Yifei Chen Woojin Choi Jaekyung Shin Hyeongjin Jeon Sooncheol Bae Young Chan Choi Seungmin Woo Young Yun Woo Hansik Oh Kang-Yoon Lee Keum Cheol Hwang Youngoo Yang Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range IEEE Access Doherty power amplifier extended output power back-off modified load network virtual open stub out-phased current combining complex combining load |
| title | Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range |
| title_full | Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range |
| title_fullStr | Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range |
| title_full_unstemmed | Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range |
| title_short | Generalized Expression and Design Method of Modified Load Networks for Doherty Power Amplifier With Extended Back-Off Range |
| title_sort | generalized expression and design method of modified load networks for doherty power amplifier with extended back off range |
| topic | Doherty power amplifier extended output power back-off modified load network virtual open stub out-phased current combining complex combining load |
| url | https://ieeexplore.ieee.org/document/9837065/ |
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