Abstract:In order to analyze the subharmonic load pull characteristic of MESFET power amplifier driven by CDMA type wide band signal, a set of Volterra transfer funcion expressions are 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.
王波; 洪兴楠; 高葆新; 庞云波. 用VOLTERRA 级数精确分析 MESFET 功率放大器的副谐波负载牵引特性[J]. 电子与信息学报, 2002, 24(7): 968-975 .
Wang Bo; Hong Xingnan; Gao Baoxin; Pang Yunbo . ANALYSIS OF THE SUBHARMONIC LOAD PULL CHARACTERISTIC OF THE MESFET POWER AMPLIFIER PRECISELY WITH THE VOLTERRA SERIES METHOD. , 2002, 24(7): 968-975 .