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| Design of 2.4 GHz GaAs HBT high linearity power amplifier |
Song ZHANG( ),Haipeng FU*() |
| School of Microelectronics, Tianjin University, Tianjin 300072, China |
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Abstract A power amplifier operating at 2.4-2.5 GHz was designed based on GaAs HBT technology to meet the requirement of high linearity and high transmission power for the Wi-Fi 6 RF front-end module. The amplifier achieved high linear output power using adaptive bias, second harmonic impedance control, and multistage amplifier distortion complementing. Output matching network insertion loss was reduced by taking advantage of bonding-wire inductance with high-quality factor, and DC and RF power detector was integrated. Test results showed that the gain of the amplifier was 30.6-30.7 dB, the input and output return loss were less than ?10 dB, the output 1 dB compression power was 29.2 dBm, and the corresponding power added efficiency was 26.4%. Under the test signal of 802.11ax standard, MCS7 modulation strategy, and 40 MHz bandwidth, the maximum output power of the amplifier was 24.1 dBm when the error vector magnitude was less than ?30 dB. Under the MCS9 modulation strategy, the maximum output power of the amplifier was 23.6 dBm when the error vector magnitude was less than ?35 dB. Under the MCS11 modulation strategy, the maximum output power of the amplifier was 22.4 dBm when the error vector magnitude was less than ?40 dB, and the corresponding maximum power added efficiency was 10.2%.
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Received: 14 June 2023
Published: 01 July 2024
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| Fund: 国家自然科学基金资助项目（62074110）；国家重点研发计划资助项目（2018YFB2202500）. |
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Corresponding Authors:
Haipeng FU
E-mail: frankz_song@163.com;hpfu@tju.edu.cn
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2.4 GHz GaAs HBT高线性度功率放大器设计
为了满足Wi-Fi 6射频前端对高线性度、高发射功率的需求，基于GaAs HBT工艺设计工作于2.4~2.5 GHz的功率放大器. 利用有源自适应偏置、二次谐波阻抗控制和多级放大器失真互补实现所设计放大器的高线性输出功率，通过键合金线的高品质因子寄生电感降低输出匹配的插损，并将直流与射频功率检测集成. 测试结果表明，所设计放大器的小信号增益为30.6~30.7 dB，输入输出回波损耗均小于?10 dB，输出1 dB压缩功率为29.2 dBm，对应功率附加效率为26.4%. 在802.11ax标准、MCS7调制策略、40 MHz带宽的测试信号下，当误差矢量幅度小于?30 dB时，所设计放大器的最大输出功率为24.1 dBm. 在MCS9调制策略下，当误差矢量幅度小于?35 dB时，所设计放大器的最大输出功率为23.6 dBm；在MCS11调制策略下，当误差矢量幅度小于?40 dB时，所设计放大器的最大输出功率为22.4 dBm，对应最大功率附加效率为10.2%.
关键词：
功率放大器,
砷化镓,
高线性度,
误差矢量幅度,
二次谐波阻抗
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