新型预失真功率放大器的研制

Design and Fabrication of New Pre-Distortion Power Amplifier

针对高线性功率放大器的实现途径,设计了一款应用模拟预失真技术与自适应预失真技术相结合的功率放大器。首先对预失真技术进行了原理性分析,阐述了模拟预失真技术的工作原理;然后给出了线性功率放大器的具体设计方案,功率放大器的频率范围为2 280～2 300 MHz,饱和输出功率为14 W,在1 dB功率压缩点(P-1)的情况下测得此功率放大器自身的三阶交调失真比为-12 dBc。实验结果表明,引入这种新型预失真技术后,线性功率放大器在P-1下的三阶交调失真比达到-20.78 dBc,三阶交调失真改善量约9 dB。证明了这种新型预失真技术方案有效并给出了这种新型线性化技术的前景与改进措施。

According to the realization way of high linear power amplifier,the power amplifier（PA） was combined of analog pre-distortion and adaptive pre-distortion technology to achieve the high linear PA.Firstly,The principle of pre-distortion was analyzed and the principle of analog pre-distortion was introduced.Then,the detailed design scheme of the linear PA was introduced.The frequency range of this PA is 2 280-2 300 MHz,and the saturated out power is 14 W,and the third order intermodulation（IMD3） is -12 dBc at 1 dB power compression（P-1） point.The measurement results show that the IMD3 of the PA reaches -20.78 dBc and the improvement in IMD3 is about 9 dB at P-1 point of the PA which utilizes the new type a pre-distortion.This new type pre-distortion was proved.Finally,this new type pre-distortion was given out the outlook and the improvement measures.