A novel linearizing technique using dual diode based linearizers for lightweight power amplifiers

摘要

A novel way to compensate the distortion of power amplifier (PA) modules is presented in this paper. A diode linearizer with an inductor is used to compensate the distortion of the PA using LDMOS FET and has a characteristic of a positive phase and a gain expansion. Two diode-based linearizers are employed to compensate the distortions. One linearizer compensates the distortion of the phase, mainly. The other compensates the ones of the gain and the phase. It is possible to compensate the distortion of the PA module using this linearizing technique even though the driver stage of the PA module has the distortion. This implies that the PA modules can operate with high efficiencies. In addition, it is possible to achieve lightweight PA modules. A modulated spectrum power of 8 dB and an EVM of 1.4 % can be improved using the proposed techniques in the PA module when a 16-QAM modulated signal is used at a 42 dBm output power and a 3 dB back-off condition.