Abstract

A novel way to compensate the distortion of Power Amplifier(PA) modules is presented in this paper.Adiodelinearizerwith an inductor is used to compensate thedistortion of the PA using LDMOS FET and has acharacteristic of a positive phase and a gain expansion.Twodiode-based linearizers are employed to compensate thedistortions. One linearizer compensates the distortion of thephase,mainly.The other compensates the ones of the gainand the phase. It is possible to compensatethe distortion of thePAmoduleusing this linearizing technique even thoughthe driver stage of the PA module has thedistortion.Thisimplies that the PA modules can operate with high efficiencies. In addition, it is possible to achieve light weight PA modules. A modulated spectrum power of 8 dB andanEVMof1.4 % can be improved using the proposed techniques in the PA module when a 16-QAM modulated signal is used at a 42dBm output power and a 3 dB back-off condition.