Accurate thermal characterization of a GaN PA MMIC using Thermoreflectance thermography

The reliability of power microwave devices is often determined by its peak operating junction temperature. In this paper, an accurate thermal characterization of a Gallium Nitride power amplifier Monolithic Microwave Integrated Circuit device using Thermoreflectance thermography is presented. The measured gate temperatures using Thermoreflectance thermography are compared with measured temperatures using Infrared thermography and calculated temperatures from finite element analysis.