一种电调Doherty功率放大器  

A Voltage Tuned Doherty Power Amplifier

作　　者：向永波[1] 颜宪鑫 阎跃鹏[1] 易整军 张浩[1] 

机构地区：[1]中国科学院微电子研究所 [2]95100部队

出　　处：《微波学报》2012年第4期73-75,80,共4页Journal of Microwaves

摘　　要：提出了一种全新的电调Doherty移动基站功率放大器。该Doherty放大器的载波放大器和峰值放大器的驱动功率分配比及输出合成相位实现了电可调,从而保证了Doherty功率放大器的最佳驱动功率分配比,以及最佳的输出合成相位,同时结合内部线性化技术以实现Doherty功率放大器的最优性能。为保证功率放大器性能的稳定,设计了一种用于Doherty功率放大器的恒静态偏置电路,在-25℃～+50℃的高低温实验中使放大器偏置电流的波动小于5%。功放的工作频率为870～890MHz,增益大于58dB。在CDMA2000信号测试下,输出功率为50.06dBm时,其ACLR(邻道泄漏功率比)小于-47.5dBc,整机效率达42.3%(含驱动级)。A new voltage tuned Doherty power amplifier （DPA） with both high efficiency and good linearity for mobile base-station is presented in the paper. The power division ratio between the carrier amplifier and the peaking amplifier of the DPA is voltage tunable, so is the synthesized output phase, thus assuring the best power division ratio and the best synthe- sized output phase, combined with the internal linearization techniques, the best performance of DPA could be achieved. A quiescent bias circuit is designed for the DPA to assure the stability, which makes a less than 5% fluctuation of the bias current of the amplifier during the high and low temperature experiment form -25 degrees to ＋50 degrees. The working frequency of the power amplifier is from 870MHz to 890MHz, with the gain larger than 58dB. The tested ACLR is better than -47.5dBc at 50. 06dBm output power under CDMA2000 test; while the overall efficiency is 42.3% （include the driving stage）.

关 键 词：DOHERTY功放 电调 邻道泄漏功率比 效率 

分 类 号：TN722.75[电子电信—电路与系统]