一种鱼骨型GaN HEMT分布式模型  

A Distributed Model for Fish-Bone Structure GaN HEMTs

作　　者：胡志富[1] 崔玉兴[1] 杜光伟[1] 方家兴[1] 武继斌[2] 蔡树军[2] 

机构地区：[1]河北半导体所,石家庄050051 [2]专用集成电路重点实验室,石家庄050051

出　　处：《半导体技术》2014年第9期671-673,698,共4页Semiconductor Technology

摘　　要：基于传输线理论,推导了GaN HEMT沟道分布式等效电路模型,为有效提取GaN HEMT小信号模型参数提供了依据。设计了一种新颖的鱼骨型GaN HEMT器件结构,由于采用了较短的栅指,非常有利于纵向散热,与常规型HEMT器件结构相比,热阻有了明显改善,但也增加了建模的复杂度。采用分布式建模技术,为鱼骨型器件建立了一种分布式等效电路模型,模型在1~20 GHz内与实测S参数吻合较好,表明分布式建模技术可以用于准确地模拟鱼骨型GaN HEMT器件的高频特性。Based on the transmission line theory,a distributed channel equivalent circuit model was deduced f or GaN HEMTs,which validated the reliability of the small-signal model extraction strategy for GaN HEMTs. A novel fish-bone structure GaN HEMT was designed and fabricated. The device adopts a short gate finger which facilitates the heat dissipation in the longitudinal direction,and the thermal resistance is improved significantly compared with the regularly designed HEMT device,while the complexity of modeling is increased. A distributed equivalent circuit model was established u tilizing distribution modeling methodology for the fish-bone device. Good agreement between the model and measurement for S parameter is obtained from 1 GHz to 20 GHz,which shows that such a modeling approach can be used to precisely characterize the high-frequency performance of a fish-bone GaN device.

关 键 词：氮化镓 高电子迁移率晶体管(HEMT) 模型 鱼骨型 分布式 

分 类 号：TN386[电子电信—物理电子学]