高效率低谐波失真宽带功率放大器设计  

Broadband Power Amplifier Design with High Efficiency and Low Harmonic Distortion

作　　者：南敬昌[1] 杜学坤[1] 韩斌 高明明[1] 李蕾[1] 

机构地区：[1]辽宁工程技术大学电子与信息工程学院,辽宁葫芦岛125105 [2]长春机械科学研究院有限公司,长春130012

出　　处：《半导体技术》2014年第1期19-23,共5页Semiconductor Technology

基　　金：国家自然科学基金资助项目(61372058);辽宁省高等学校优秀科技人才支持计划(LR2013012)

摘　　要：基于连续型功率放大器理论，提出一种高效低谐波失真宽带功率放大器的设计方法，并采用GaN高电子迁移率晶体管（HEMT）器件设计了验证电路。结合连续型功率放大器理论和多谐波双向牵引技术，找到一簇最佳负载阻抗值，并运用切比雪夫低通滤波器形式的阻抗变换器设计宽带匹配网络。偏置电路采用双扇形开路微带线和滤波电路相结合的方法进行设计，以减小电路尺寸和扩展具有高输入阻抗偏置电路的带宽。实验结果表明，在1．7～2．7GHz工作频带内，功率附加效率为50％～60％，输出功率大于4W，增益为（14±0．9）dB，二次谐波失真小于-25dBc，三次谐波失真小于-60dBc。Based on the continuous power amplifier （PA） theory, a design method of the broadband power amplifier with high efficiency and low harmonic distortion was presented and a test cir- cuit was designed using GaN high electron mobility transistor （HEMT） device. Combined with continuous PA theory and multi-harmonic bilateral-pull technology, a family of optimal load impedances was obtained. Using Chebyshev low-pass impedance transformation, broadband matching network was designed. Combined with butterfly stub and filter circuit, biasing circuit was designed, in order to de- crease circuit dimension and extend bandwidth of the high input impedance biasing circuit. Experimental results show that from 1.7 GHz to 2.7 GHz, the power added efficiency （r/PAE） is 50%--60% with （ 14±0.9） dB power gain, the output power is more than 4 W, the second harmonic distortion is less than -25 dBc and the third harmonic distortion is less than -60 dBc.

关 键 词：连续型功率放大器(PA) 多谐波双向牵引技术 谐波控制 宽带偏置电路 谐波失真 

分 类 号：TN722.75[电子电信—电路与系统]