Memory effects compensation in RF power amplifiers by using envelope injection technique

This paper addresses the compensation of memory effects in RF power amplifiers (PAs). Such effects impair the cancellation performance of most linearization methods. This study applies the envelope injection technique together with memoryless RF predistortion to a MESFET PA. The results, corroborated by simulations and measurements, show a good improvement in cancellation performance both in the modulation frequency and the amplitude domain. Also, the paper presents new simulation and measurement techniques for characterizing the optimum injection signal.