一种模拟预失真线性化微波功率放大器  

An Analog Predistortion Linearization for Microwave Power Amplifier

作　　者：辜文婷[1] 李斌[1] 黄微波[1] 

机构地区：[1]电子科技大学物理电子学院大功率微波电真空器件与技术国防科技重点实验室,四川成都610054

出　　处：《真空电子技术》2008年第5期1-4,共4页Vacuum Electronics

摘　　要：研究了一种新的模拟预失真线性化电路,它由2对工作于不同偏置电压下的反向并联肖特基二极管对以及电容、电阻,3 dB电桥耦合器(Hybrid)、可变增益放大器组成,通过调节二极管对的偏置电压可分别控制产生IM3和IM5信号的幅度和相位。利用专用的微波电路仿真工具ADS进行仿真验证,仿真结果表明在2 GHz频段功率放大器的增益压缩和相位偏移在1 dB压缩点附近分别补偿了1.5 dB和9.3°,双音测试表明,在输出功率为41.8 dBm时,IMD3和IMD5分别改善了26和10 dB。A new analog predistortion linearization is proposed in this paper, which includes two pairs of anti-parallel Schottky diodes biased on different voltage, capacitance, resistance and 3 dB Hybrid, voltage-controlled amplifier. By adjusting the voltage of anti-parallel Schottky diodes, the amplitude and phase of IM3 and IM5 can be controlled. Computer emulated results show that the gain and phase compensation are l. 5 dB and 9.3° respectively near the 1 dB gain compression. Two tones test results show that the improvements in IMD3 and IMD5 cancellations are 26 dB and 10 dB respectively with the output power about 41.8 dBm.

关 键 词：预失真 线性化 微波功率放大器 肖特基二极管 ADS 

分 类 号：TN722.1[电子电信—电路与系统]