Compensation of Power Amplifier Long-Term Memory Behavior for Pulsed Radar Applications

Pulsed radar amplifiers are known to present severe long-term memory effects in their pulse-to-pulse stability. These are usually attributed to electrothermal dynamics or to trapping effects originated in gallium-nitride (GaN) HEMTs. Expanding on our previous work where we devised a method for determining a suitable dynamic variation in the HEMT's gate-source voltage for compensating these long-term memory effects in single-ended amplifiers, in this article, we present a feed-forward model to calculate this compensation signal in real-time pulsed radar applications.