用VOLTERRA级数精确分析MESFET功率放大器的副谐波负载牵引特性  

ANALYSIS OF THE SUBHARMONIC LOAD PULL CHARACTERISTIC OF THE MESFET POWER AMPLIFIER PRECISELY WITH THE VOLTERRA SERIES METHOD

作　　者：王波[1] 洪兴楠[1] 高葆新[1] 庞云波[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《电子与信息学报》2002年第7期968-975,共8页Journal of Electronics & Information Technology

摘　　要：为了分析CDMA类宽带信号激励下MESFET功放的副谐波负载牵引特性,推导了一组基于MESFET非线性模型的功放电路Volterra转移函数解析式,利用此解析式,建立了三阶交调分量与副谐波负载的解析关系,分析了不同副谐波负载情况下副谐波牵引特性;并推导出了最优副谐波负载的表达式。该文还从两个三阶交调幅度的差异着手,证明了电抗性副谐波负载是造成这一差异的主要因素,上述推导得到的结果与采用ADS软件谐波平衡法仿真得到的结果吻合得很好。In order to analyze the subharmonic load pull characteristic of the MESPET power amplifier driven by CDMA type wide band signal, a set of Volterra transfer funcion expressions arc deducted with the MESFET nonlinear model. With these expressions, the relation between the IM3 (third order intermodulation) and the subharmonic impedance is established, and the characteristic of the subharmonic load pull is analyzed. The expression of the optimal subharmonic load is also given with the analysis. It is proved in the paper that the reactance part of the subharmonic impedance is the main factor that leads to the difference of the two IM3. The result of the analysis agrees well with the simulation result got from ADS with harmonic balance method.

关 键 词：牵引特性 副谐波负载 非线性电路分析 微波CAD 微波放大器 Volterra级数法 

分 类 号：TN722.75[电子电信—电路与系统]