GaN逆F类高效率功率放大器及线性化研究-电子与信息学报.PDF

第 34 卷第 4 期 电 子 与 信 息 学 报 Vol.34No.4 2012 年 4 月 Journal of Electronics Information Technology Apr. 2012 GaN 逆F 类高效率功率放大器及线性化研究 徐樱杰 王晶琦 朱晓维* (东南大学毫米波国家重点实验室 南京 210096) 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 。 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 中图分类号：TN722 文献标识码： A 文章编号：1009-5896(2012)04-0981-05 DOI: 10.3724/SP.J.1146.2011.00382 Investigation on GaN Inverse Class-F Highly Efficient Power Amplifier and Linearization Xu Ying-jie Wang Jing-qi Zhu Xiao-wei (State key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China) 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, Adjac