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Gate Pulsing as a Transient Ringing Reduction Method for Multi-Level Supply Modulators

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Title: Gate Pulsing as a Transient Ringing Reduction Method for Multi-Level Supply Modulators
Authors: Nogales, Connor, Popovic, Zoya, Lasser, Gregor, 1983
Source: IEEE Transactions on Power Electronics. 38(8):9358-9361
Subject Terms: Transistors, Modulation, Voltage measurement, Resistance, Switches, Ringing, Multi-Level Converter, Power Amplifier, Logic gates, Supply Modulation, Envelope tracking, Optimization
Description: This letter demonstrates a gate pulsing technique to reduce the ringing in multi-level dynamic voltage supplies used for modulating the drain bias of GaN radio-frequency power amplifiers (RFPAs). Supply modulation can improve overall average efficiency when the RFPA is amplifying signals with varying envelopes. Multi-level discrete supply modulators (SMs) are used for high instantaneous bandwidth signals when continuous modulators become inefficient. These SMs provide several voltage levels to the RFPA using transistor switches. By pulsing the gate drive of switches on and off quickly before ultimately turning them on, the switches undergo an intermediate lossy state which reduces the ringing. The pulse settings can be individually adjusted for different voltage level transitions and loads. Gate pulsing is compared to conventional ringing reduction techniques such as varying the fixed series gate resistance, and dead-time optimization. Gate pulsing experimental results with a 4-level SM and 8 MHz 64-QAM signal show a significant improvement in ringing over dead-time optimization with only a 0.9% points drop in efficiency.
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  Data: Gate Pulsing as a Transient Ringing Reduction Method for Multi-Level Supply Modulators
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Nogales%2C+Connor%22">Nogales, Connor</searchLink><br /><searchLink fieldCode="AR" term="%22Popovic%2C+Zoya%22">Popovic, Zoya</searchLink><br /><searchLink fieldCode="AR" term="%22Lasser%2C+Gregor%22">Lasser, Gregor</searchLink>, 1983
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  Data: <i>IEEE Transactions on Power Electronics</i>. 38(8):9358-9361
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  Data: <searchLink fieldCode="DE" term="%22Transistors%22">Transistors</searchLink><br /><searchLink fieldCode="DE" term="%22Modulation%22">Modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Voltage+measurement%22">Voltage measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Resistance%22">Resistance</searchLink><br /><searchLink fieldCode="DE" term="%22Switches%22">Switches</searchLink><br /><searchLink fieldCode="DE" term="%22Ringing%22">Ringing</searchLink><br /><searchLink fieldCode="DE" term="%22Multi-Level+Converter%22">Multi-Level Converter</searchLink><br /><searchLink fieldCode="DE" term="%22Power+Amplifier%22">Power Amplifier</searchLink><br /><searchLink fieldCode="DE" term="%22Logic+gates%22">Logic gates</searchLink><br /><searchLink fieldCode="DE" term="%22Supply+Modulation%22">Supply Modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Envelope+tracking%22">Envelope tracking</searchLink><br /><searchLink fieldCode="DE" term="%22Optimization%22">Optimization</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: This letter demonstrates a gate pulsing technique to reduce the ringing in multi-level dynamic voltage supplies used for modulating the drain bias of GaN radio-frequency power amplifiers (RFPAs). Supply modulation can improve overall average efficiency when the RFPA is amplifying signals with varying envelopes. Multi-level discrete supply modulators (SMs) are used for high instantaneous bandwidth signals when continuous modulators become inefficient. These SMs provide several voltage levels to the RFPA using transistor switches. By pulsing the gate drive of switches on and off quickly before ultimately turning them on, the switches undergo an intermediate lossy state which reduces the ringing. The pulse settings can be individually adjusted for different voltage level transitions and loads. Gate pulsing is compared to conventional ringing reduction techniques such as varying the fixed series gate resistance, and dead-time optimization. Gate pulsing experimental results with a 4-level SM and 8 MHz 64-QAM signal show a significant improvement in ringing over dead-time optimization with only a 0.9% points drop in efficiency.
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      – Type: doi
        Value: 10.1109/TPEL.2023.3278210
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      – Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 4
        StartPage: 9358
    Subjects:
      – SubjectFull: Transistors
        Type: general
      – SubjectFull: Modulation
        Type: general
      – SubjectFull: Voltage measurement
        Type: general
      – SubjectFull: Resistance
        Type: general
      – SubjectFull: Switches
        Type: general
      – SubjectFull: Ringing
        Type: general
      – SubjectFull: Multi-Level Converter
        Type: general
      – SubjectFull: Power Amplifier
        Type: general
      – SubjectFull: Logic gates
        Type: general
      – SubjectFull: Supply Modulation
        Type: general
      – SubjectFull: Envelope tracking
        Type: general
      – SubjectFull: Optimization
        Type: general
    Titles:
      – TitleFull: Gate Pulsing as a Transient Ringing Reduction Method for Multi-Level Supply Modulators
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            NameFull: Lasser, Gregor
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            – D: 01
              M: 01
              Type: published
              Y: 2023
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              Value: 38
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              Value: 8
          Titles:
            – TitleFull: IEEE Transactions on Power Electronics
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