High Efficiency, High Linearity, Switch Mode Power Amplifiers for Varying envelop Signal Applications

Transmission of big h-order modulated signals at sufficient linearity while maintaining high power efficiency is always a challenge in modern communication application. Using conventional transmitter topologies, high linearity and high efficiency are two conflicting parameters somehow. However using switch-mode power amplifier aided by various linearization techniques can present a feasible way to achieve both high linearity and high power efficiency. In this paper two different implementations of the switch-mode power amplifier a re p resented for varying envelop applications: the RF pulse width modulation technology and the outphasing configuration with SDR pre-distortion technology. The results presented show that all three solutions are capable of providing adequate performance