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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。
Aiming at the realization of high linearity power amplifier, a power amplifier combining analog pre-distortion and adaptive predistortion is designed. First of all, the principle of pre-distortion technology is analyzed, and the working principle of analog pre-distortion technology is expounded. Then the design scheme of linear PA is given. The power amplifier has a frequency range of 2 280 ~ 2 300 MHz, a saturated output power of 14 W, the third-order intermodulation distortion of the PA is -12 dBc at 1 dB power compression point (P-1). Experimental results show that the linear PA has a third-order intermodulation distortion of -20.78 dBc at P-1 and an improvement of about 9 dB of third-order intermodulation distortion after introducing this new predistortion technique. It proves that this new predistortion scheme is effective and gives the prospect and improvement of this new linearization technique.