GaN逆F类高效率功率放大器及线性化研究  

Investigation on GaN Inverse Class-F Highly Efficient Power Amplifier and Linearization

作　　者：徐樱杰[1] 王晶琦[1] 朱晓维[1] 

机构地区：[1]东南大学毫米波国家重点实验室,南京210096

出　　处：《电子与信息学报》2012年第4期981-985,共5页Journal of Electronics & Information Technology

基　　金：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

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。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.

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 

分 类 号：TN722[电子电信—电路与系统]