This paper presents a newly developed compact model HiSIM-GaN [Hiroshima University STARC IGFET Model for GaN high electron mobility transistors (HEMTs)]. The developed model includes two specific features of GaN-HEMT to reproduce the power efficiency accurately. One is the two-dimensional electron gas induced at the heterojunction, which is modeled by considering the potential distribution across the junction including the trap density contribution. The second feature is the field plate, which is introduced to delocalize the electric-field peak that occurs at the electrode edge. Using HiSIM-GaN, device characteristics have been simulated. It is demonstrated that measured DC/AC characteristics are well reproduced with the developed model. The model has also been applied to analyze circuit characteristics of a boost converter. It is shown that the waveform is well reproduced by considering one half of the trap density extracted with measured DC characteristics due to the time constant of trap events. Furthermore, it is verified that the power efficiency as a function of the load current is predicted within an accuracy of 1%. Influence of the trap density and the field plate on circuit performances is also discussed.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)