Measurement of Channel Temperature in GaN High-Electron Mobility Transistors

In this paper, a simple and reliable method to estimate the channel temperature of GaN high-electron mobility transistors (HEMTs) is proposed. The technique is based on electrical measurements of performance-related figures of merit ( I Dmax and R ON ) with a synchronized pulsed I - V setup. As our technique involves only electrical measurement, no special design in device geometry is required, and packaged devices can be measured. We apply this technique to different device structures and validate its sensitivity and robustness.