| GaN逆F类高效率功率放大器及线性化研究 |
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| 引用本文： | 徐樱杰,王晶琦,朱晓维. GaN逆F类高效率功率放大器及线性化研究[J]. 电子与信息学报, 2012, 0(4): 981-985 |
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| 作者姓名： | 徐樱杰 王晶琦 朱晓维 |
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| 作者单位： | 东南大学毫米波国家重点实验室南京210096 |
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| 基金项目： | 国家自然科学基金(60921063);国家863计划项目(2009AA011801);国家科技重大专项(2010ZX03007-003-02)资助课题 |
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| 摘 要： | 效率和线性度是功率放大器的重要指标,也是设计的技术难点。该文设计了2.5-2.6 GHz高效率GaN逆F类功率放大器,其输入输出谐波匹配网络由解析的方法设计得到。单音测试结果表明,在2.55 GHz处,功放的漏极效率超过75%。为了建立逆F类功放的行为模型进行数字预失真,对传统的Hammerstein模型进行了改进,提升了模型拟合精度,对20 MHz带宽、峰均功率比为9.6 dB的16-QAM OFDM调制信号,结合峰值因子降低技术和数字预失真技术对逆F类功放进行线性化后,功放的相邻信道功率比(ACPR)优于-48 dBc。
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| 关 键 词： | 功率放大器 氮化镓 逆F类 哈默斯坦模型 数字预失真 |
Investigation on GaN Inverse Class-F Highly Efficient Power Amplifier and Linearization |
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| u Ying-jie,g Jing-qi,hu Xiao-wei. Investigation on GaN Inverse Class-F Highly Efficient Power Amplifier and Linearization[J]. Journal of Electronics & Information Technology, 2012, 0(4): 981-985 |
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| Authors: | u Ying-jie g Jing-qi hu Xiao-wei |
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| Affiliation: | (State key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China) |
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| Abstract: | Efficiency and linearity are two key features and design difficulties of Power Amplifier(PA).In this paper, a 2.5-2.6 GHz highly efficient GaN inverse class-F PA is designed.The input and output harmonic matching networks are designed through analytical approach.According to single tone test,the drain efficiency of the PA is over 75% at 2.55 GHz.In order to establish the behavioral model of the proposed PA and perform digital predistortion,the conventional Hammerstein model is modified so as the modeling accuracy is improved.For a 20 MHz 16-QAM OFDM signal with Peak-to-Average Power Ratio(PAPR) of 9.6 dB,the proposed PA is linearized by combining Crest Factor Reduction(CFR) and digital predistortion techniques.After linearization,Adjacent Channel Power Ratio(ACPR) of the PA is suppressed to below-48 dBc. |
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| Keywords: | Power Amplifier(PA) GaN Inverse class-F Hammerstein model Digital PreDistortion(DPD) |
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