Sequential LMBA Design Technique for Improved Bandwidth Considering the Balanced Amplifiers off-State Impedance
This work proposes a design technique to improve the bandwidth of sequential load-modulated balanced amplifiers (SLMBAs). It is theoretically demonstrated that a finite off-state impedance of the balanced power amplifiers (BPAs) degrades the overall SLMBA performance, especially between the two effi...
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| Veröffentlicht in: | IEEE transactions on microwave theory and techniques 2023-08, Vol.71 (8), p.1-15 |
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| container_title | IEEE transactions on microwave theory and techniques |
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| creator | Belchior, Catarina Nunes, Luis C. Cabral, Pedro M. Pedro, Jose C. |
| description | This work proposes a design technique to improve the bandwidth of sequential load-modulated balanced amplifiers (SLMBAs). It is theoretically demonstrated that a finite off-state impedance of the balanced power amplifiers (BPAs) degrades the overall SLMBA performance, especially between the two efficiency peaks, i.e., when the BPAs start to operate. Moreover, it is shown that this issue is especially important when high-power devices are considered. The new proposed design technique optimizes the load trajectory of the BPAs, by properly designing their output matching networks, considering the actual off-state impedance. The method avoids the use of the conventional narrowband compensation offset lines strategy, being able to obtain optimum efficiency and output power performance when the BPAs are turned on across wide bandwidths. The proposed design technique is explained and validated with a practical 1.3-2.1-GHz 200-W GaN HEMT-based SLMBA prototype. |
| doi_str_mv | 10.1109/TMTT.2023.3241690 |
| format | Article |
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It is theoretically demonstrated that a finite off-state impedance of the balanced power amplifiers (BPAs) degrades the overall SLMBA performance, especially between the two efficiency peaks, i.e., when the BPAs start to operate. Moreover, it is shown that this issue is especially important when high-power devices are considered. The new proposed design technique optimizes the load trajectory of the BPAs, by properly designing their output matching networks, considering the actual off-state impedance. The method avoids the use of the conventional narrowband compensation offset lines strategy, being able to obtain optimum efficiency and output power performance when the BPAs are turned on across wide bandwidths. The proposed design technique is explained and validated with a practical 1.3-2.1-GHz 200-W GaN HEMT-based SLMBA prototype.</description><subject>Balanced amplifier</subject><subject>broadband</subject><subject>Design optimization</subject><subject>high efficiency</subject><subject>Impedance</subject><subject>load modulation</subject><subject>Narrowband</subject><subject>Performance evaluation</subject><subject>Power amplifiers</subject><subject>power amplifiers (PAs)</subject><subject>Push-pull amplifiers</subject><subject>Reflection coefficient</subject><subject>Transistors</subject><subject>Voltage</subject><subject>Wideband</subject><issn>0018-9480</issn><issn>1557-9670</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNpNkMtOwzAQRS0EEqXwAUgsLLFOsR3HdpZteVVqxaJhHSX2uHWVJsVOQfw9jtoFq9HonjuPi9A9JRNKSf5UrIpiwghLJynjVOTkAo1olskkF5JcohEhVCU5V-Qa3YSwiy3PiBqhbg1fR2h7VzV4uZpN8TMEt2lxAXrbuihh23m82B989w0Gz6rW_DjTb_G8a4Mz4F27wf0WotJUrY7IdH9onHXgA-6sTdZ91cMwAMyg36IrWzUB7s51jD5fX4r5e7L8eFvMp8tEs5z3iWRCG6aJoZmomZXGgqC1MJKaOhfAtUmtsZXJiDCUMQuc8NrkXDCllap1OkaPp7nx8PhF6Mtdd_RtXFkyxWWeSZnRSNETpX0XggdbHrzbV_63pKQcci2HXMsh1_Kca_Q8nDwOAP7xhCtJRfoHdJN1lw</recordid><startdate>20230801</startdate><enddate>20230801</enddate><creator>Belchior, Catarina</creator><creator>Nunes, Luis C.</creator><creator>Cabral, Pedro M.</creator><creator>Pedro, Jose C.</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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| subjects | Balanced amplifier broadband Design optimization high efficiency Impedance load modulation Narrowband Performance evaluation Power amplifiers power amplifiers (PAs) Push-pull amplifiers Reflection coefficient Transistors Voltage Wideband |
| title | Sequential LMBA Design Technique for Improved Bandwidth Considering the Balanced Amplifiers off-State Impedance |
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