Albahrani, Sayed AliSayed AliAlbahraniHeuken, LarsLarsHeukenSchwantuschke, DirkDirkSchwantuschkeGneiting, ThomasThomasGneitingBurghartz, Joachim N.Joachim N.BurghartzKhandelwal, SourabhSourabhKhandelwal2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26236910.1109/TED.2019.2961773In this article, the gate current in AlGaN/GaN high-electron mobility transistors is modeled in a surface potential-based compact model. The thermionic emission, the Poole-Frenkelemission, and the Fowler-Nordheimtunneling are the dominant mechanisms for the gate current in the forward- and reverse-bias regions. These conduction mechanisms are modeled within the framework of the ASM-GaN compact model, which is a physics-based industry-standard model for GaN HEMTs, hence yielding a consistent model for the drain and gate currents. The proposed model captures the gate voltage, drain voltage, temperature, and gate-length dependencies of the gate current. The results of dc gate-leakage measurements of two GaN HEMT, differing only in terms of gate length, over a wide range of temperature, showing these current-conduction mechanisms, are presented, and the proposed model is validated accordingly. The developed gate current model, implemented in Verilog-A, is in excellent agreement with the experimental data.encompact modelFowler-Nordheim (FN) tunnelingGaN high-electron mobility transistor (HEMT)gate leakage currentPoole-Frenkel (PF) emissionhermionic emission (TE)667621journal article