Journal of Computer Applications ›› 2017, Vol. 37 ›› Issue (8): 2421-2426.DOI: 10.11772/j.issn.1001-9081.2017.08.2421

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Modeling of power amplifier based on dynamic X-parameter of new two-dimensional kernel function

NAN Jingchang, CUI Hongyan   

  1. School of Electronic and Information Engineering, Liaoning Technical University, Huludao Liaoning 125105, China
  • Received:2017-01-17 Revised:2017-03-04 Online:2017-08-10 Published:2017-08-12
  • Supported by:
    This work is partially supported by the National Natural Science Foundation of China (61372058),the Key Laboratory Project of Higher Education of Liaoning Province (LJZS007).


南敬昌, 崔洪艳   

  1. 辽宁工程技术大学 电子与信息工程学院, 辽宁 葫芦岛 125105
  • 通讯作者: 崔洪艳
  • 作者简介:南敬昌(1971-),男,河南滑县人,教授,博士,主要研究方向:射频电路与系统、电路系统与电磁仿真、信号处理与信息编码;崔洪艳(1993-),女,辽宁抚顺人,硕士研究生,主要研究方向:射频功放非线性分析、射频电路设计。
  • 基金资助:

Abstract: In order to accurately describe the characteristics of Radio Frequency (RF) power amplifier with memory effect, a new dynamic X-parameter amplifier modeling method based on traditional dynamic X-parameter model was proposed by combining with long-term memory effect and short-term memory effect. The new model preserves static kernel function of X-parameter model. A nonlinear function of memory was extracted by using the two-memory path model to replace dynamic kernel function. A novel FeedBack (FB) structure was proposed in which the output signal is a bivariate of amplitude and frequency, and the time-varying frequency variable was introduced to simplify the dynamic kernel function as a two-dimensional kernel function. The power amplifier was designed and modeled by the MW6S010N transistors. Simulation results indicate that the new model can correctly represent the characteristics of power amplifier with the excitation of single-tone large signal and Code Division Multiple Access (CDMA) signal. The Normalized Mean Square Error (NMSE) of the proposed method was decreased by 8.0 dB, 6.3 dB and 2.5 dB, respectively, in comparison with static X-parameter model, traditional dynamic X-parameter model and FeedForward (FF) structure X-parameter model. It is proved that the proposed model can more accurately fit the characteristics of power amplifier with nonlinear memory effect.

Key words: two-dimensional kernel function, dynamic X-parameter, FeedBack (FB) structure, memory effect, power amplifier, behavior model

摘要: 为了更准确地描述带有记忆效应的射频(RF)功放特性,基于传统的动态X参数模型,结合功放长期记忆效应以及短期记忆效应机理,提出一种新型动态X参数功放建模方法。新模型保留X参数模型的静态核函数,利用双记忆路径模型提取出表征记忆效应的非线性函数,替换动态核函数。采用输出信号为幅度与频率双变量的新型反馈(FB)结构,引入时变频率变量而简化动态核函数为二维核函数。使用MW6S010N设计功放并建模,由仿真可知,新模型在单音大信号及码分多址(CDMA)信号激励下,均能正确表征功放特性,归一化均方误差(NMSE)较静态X参数模型、传统动态X参数模型以及前馈(FF)结构X参数模型分别减少8.0 dB、6.3 dB、2.5 dB。结果表明该模型能够更加准确拟合带有非线性记忆效应功率放大器的特性。

关键词: 二维核函数, 动态X参数, 反馈结构, 记忆效应, 功率放大器, 行为模型

CLC Number: