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Design of a 200-W High-Efficiency Cascaded LDMOS: Microwave Source with Digital Power Control.

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Title: Design of a 200-W High-Efficiency Cascaded LDMOS: Microwave Source with Digital Power Control.
Authors: Li, Zhiqi1, Zhang, Dan1 zhangdan@njfu.edu.cn, Sun, Yan1
Source: Progress in Electromagnetics Research C. 2026, Vol. 169, p31-38. 8p.
Subjects: Power amplifiers, Impedance matching, Microwave heating, Microwave amplifiers, Frequency synthesizers, Transistors
Abstract: This study designs and experimentally validates a digitally controlled 2.45 GHz solid-state microwave power source for industrial continuous-wave operation. The source employs a cascaded laterally diffused metal oxide semiconductor (LDMOS) architecture integrating a phase-locked loop frequency synthesizer, a multi-stage driver chain, and a closed-loop digital power-control network with 0.5-dB resolution. The final-stage power amplifier (PA) is biased in deep class-AB, and a lumped-element matching network is synthesized -- guided by load-pull and harmonic-impedance analysis -- to realize a near-short termination at the second harmonic and reduce voltage-current overlap energy. Nonlinear device modelling and system-level analysis are used to predict efficiency and stability. Measurements show a saturated output power of 54.09 dBm, gain of 18.14 dB, and peak power-added efficiency of 61.89% under a 28-V supply. The source achieves accurate continuous-wave (CW) power regulation from 35 to 53 dBm with good thermal stability. These results indicate that combining deep class-AB biasing with second-harmonic near-short termination enables high-efficiency operation in L/S-band industrial microwave sources, and the cascaded digitally controlled architecture provides robust power management for microwave heating and plasma excitation systems. [ABSTRACT FROM AUTHOR]
Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193720666
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  Label: Title
  Group: Ti
  Data: Design of a 200-W High-Efficiency Cascaded LDMOS: Microwave Source with Digital Power Control.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Zhiqi%22">Li, Zhiqi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Dan%22">Zhang, Dan</searchLink><relatesTo>1</relatesTo><i> zhangdan@njfu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Sun%2C+Yan%22">Sun, Yan</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 169, p31-38. 8p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Power+amplifiers%22">Power amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Impedance+matching%22">Impedance matching</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+heating%22">Microwave heating</searchLink><br /><searchLink fieldCode="DE" term="%22Microwave+amplifiers%22">Microwave amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Frequency+synthesizers%22">Frequency synthesizers</searchLink><br /><searchLink fieldCode="DE" term="%22Transistors%22">Transistors</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study designs and experimentally validates a digitally controlled 2.45 GHz solid-state microwave power source for industrial continuous-wave operation. The source employs a cascaded laterally diffused metal oxide semiconductor (LDMOS) architecture integrating a phase-locked loop frequency synthesizer, a multi-stage driver chain, and a closed-loop digital power-control network with 0.5-dB resolution. The final-stage power amplifier (PA) is biased in deep class-AB, and a lumped-element matching network is synthesized -- guided by load-pull and harmonic-impedance analysis -- to realize a near-short termination at the second harmonic and reduce voltage-current overlap energy. Nonlinear device modelling and system-level analysis are used to predict efficiency and stability. Measurements show a saturated output power of 54.09 dBm, gain of 18.14 dB, and peak power-added efficiency of 61.89% under a 28-V supply. The source achieves accurate continuous-wave (CW) power regulation from 35 to 53 dBm with good thermal stability. These results indicate that combining deep class-AB biasing with second-harmonic near-short termination enables high-efficiency operation in L/S-band industrial microwave sources, and the cascaded digitally controlled architecture provides robust power management for microwave heating and plasma excitation systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.2528/PIERC26020805
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: 31
    Subjects:
      – SubjectFull: Power amplifiers
        Type: general
      – SubjectFull: Impedance matching
        Type: general
      – SubjectFull: Microwave heating
        Type: general
      – SubjectFull: Microwave amplifiers
        Type: general
      – SubjectFull: Frequency synthesizers
        Type: general
      – SubjectFull: Transistors
        Type: general
    Titles:
      – TitleFull: Design of a 200-W High-Efficiency Cascaded LDMOS: Microwave Source with Digital Power Control.
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            NameFull: Li, Zhiqi
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            NameFull: Zhang, Dan
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            NameFull: Sun, Yan
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          Dates:
            – D: 01
              M: 07
              Text: 2026
              Type: published
              Y: 2026
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              Value: 169
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            – TitleFull: Progress in Electromagnetics Research C
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