级联放大器整体线性和效率设计方法研究  

Design on Integral Linearity and Efficiency of Cascaded Power Amplifiers

作　　者：何军[1] 蒋庐俊[1] 赵洪汐 

机构地区：[1]中国电子科技集团公司第三十研究所,四川成都610041 [2]四川航天职业技术学院,四川成都610100

出　　处：《通信技术》2017年第6期1309-1313,共5页Communications Technology

摘　　要：在级联功率放大器测试中,观察到前后级功率放大器的线性度相互影响。通过改变驱动级偏置状态,可以使末级功率放大器输出较好的线性度。为探索整机效率和线性最佳折中设计方法,开展了驱动级的偏置和相应的匹配对整机影响的理论研究和实物实验。实验中驱动级和末级功放均偏置在AB类,均采用LDMOS管,中心频率为1.1 GHz且间隔4 MHz的双音信号,测试满足IMD3小于-35 dBc,系统整体的PAE(功率附加效率)大于43%,增益大于46 dB。In the test of cascaded power amplifier, the interaction of front and back stage power amplifier linearity is observed. By changing the bias state of drive stage, the last stage power amplifier can make an output of better linearity. In order to explore the whole machine efficiency and the best compromise design of linearity, the theoretical research and physical experiment are done, and the influence of the drive stage bias and the corresponding matching on the whole machine also discussed. In the experiment, the driver stage and the last stage power amplifier are all biased in the AB class. Meanwhile the LDMOS tube is used, with the center frequency of 1.1 GHz and is separated by 4 MHz dual tone signal. The test satisfies the requirement of IMD3 less than-35 dBc, and the overall PAE of the system is greater than 43% and the gain greater than 46 dB.

关 键 词：级联放大器 线性度 整机效率 栅极偏置 

分 类 号：TN722.75[电子电信—电路与系统]