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On the Thermal Memory Effect Reduction of Power Amplifiers Using Pulse Modulation

This letter presents a study of thermal memory effect reduction for pulse-modulated polar transmitters (PMPTs). PMPTs using pulse modulation have shown very low memory effects even when operated at high-power levels in the previous literature. In this letter, thermal simulations were performed to study the effects of pulse modulation. The simulation results show that the pulse modulation not only reduces the increase of temperature but also temperature variation. Temperature variation is the main source of thermal-related memory effect since temperature change affects parameters such as internal transconductance, resistances, and capacitances. Furthermore, the simulation and measurement results indicate that modern 4G and 5G signals with high peak-to-average power ratios actually help reduce thermal-related memory effects in PMPTs.