【摘要】 研究了一种改善射频功放记忆效应的方法并对所设计的低记忆功放进行了行为级建模。设计了10W峰值功率的射频功放,通过加载漏级低阻抗终端并结合最佳电流偏置的方法来减少功放的记忆效应。在建模过程中应用了Cao方法估计功放的记忆长度并进行了验证。基于上述技术,文中所设计的低记忆射频功放能够用简单模型精确描述。实验结果表明,对设计的低记忆功放,采用仅包含7个复系数的Hammerstein模型就可以得到-48.5dB的归一化均方误差(NMSE)指标。更多还原

【Abstract】 In this paper,a systematic methodology for characterizing a radio frequency power amplifier with minimized memory effects is investigated.A 10W peak power amplifier is designed and appropriately biased for memory effects reduction.The memory length of the designed power amplifier is estimated accurately by using the "false nearest neighbors" principles and experimentally verified.Based on the above techniques,the designed power amplifier can be characterized by a very simple model with high accuracy.Experimental results show that the normalized mean square error better than-48dB is achieved when a Hammerstein model with only 7 complex coefficients is adopted.更多还原