Doherty高效功率放大器的设计  

Design of Doherty Power Amplifier with High Efficiency

作　　者：吴毅威[1] 唐宗熙[1] 张彪[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《半导体技术》2010年第1期31-33,38,共4页Semiconductor Technology

摘　　要：根据Doherty技术设计并实现了运用于2010～2025MHz频段的高效率功率放大器。在设计Doherty放大器过程中采用了放大器单管双向牵引优化方法提高单管功率放大器效率,通过对晶体管的双向牵引(源牵引和负载牵引)仿真得到单管匹配优化网络,通过调节补偿线对Doherty放大电路进行整体优化设计。仿真结果表明,与传统的平衡式AB类放大器相比,在传输功率回退较大的高峰均比信号时,Doherty技术在功率附加效率上有10%左右的提高。得到实物测试结果为在输出功率回退6dB时,效率为30.1%,增益为9.9dB。该功率放大器结构简单,适用于无线通信领域。Base on the Doherty technique, a power amplifier with high efficiency operating from 2 010 to 2 025 MHz was designed and realized. An optimal bilateral-pull method was used to increase efficiency of the single power amplifier. Source-pull and load-pull simulation of the transistor were used to obtain the optimal match network, and the Doherty power amplifier was optimized. The simulation result shows that in high PAR signal, the PAE （power added efficiency） of the Doherty power amplifier has 10% increase compared to traditional balanced class AB power amplifier. The experimental testing result are PAE 30%, gain 9.9 dB. The power amplifier configuration is simple and it can be used in wireless communication.

关 键 词：多尔蒂 负载牵引 效率 功率放大器 双向牵引 匹配网络 

分 类 号：TN72[电子电信—电路与系统]