Class G power amplifier synthesis based on the probability density function dependence of the transmitted signal

The article describes the technique of parametric synthesis of a class G power amplifier with maximum drain efficiency at the average output power with high PAPR (peak to average power ratio). The proposed technique was applied to an advanced OFDM signal of LTE standard. The optimal parameters of the envelope amplifier for LTE signal were received on the basis of proposed theoretical calculation. Proposed technique validity was confirmed experimentally by measuring the 3-level class G power amplifier prototype. The prototype operates in the frequency range of 700–1000 MHz and has a maximum power 44.3 dBm. It also has a drain efficiency of 30% at power output back-off equal to the peak to average power ratio of LTE signal. From the consistency of the computational and experimental results, it is possible to predict increasing a drain efficiency from 30% to 39.5% by using the digital pre-distortion system and the 5-level envelope amplifier.