物理学报2011，Vol.60Issue(4)：310-315,6.
能带工程对射频功率SiGe异质结双极晶体管热性能的改善
Effect of bandgap engineering on thermal characteristic of radio frequency power SiGe heterojunction bipolar transistor
摘要
Abstract
As is well known, direct-current (DC) characteristic, frequency characteristic and noise characteristic of SiGe heterojunction bipolar transistor(HBT) can be improved by "bandgap engineering"( by Ge composition). However, the effect of "bandgap engineering" on the thermal characteristic of HBT has not been reported. In this paper, the effect of "bandgap engineering" is analyzed by the use of 3D thermal-electric feedback model. Considering the temperature dependence of emitter junction voltage and current gain, the expression of the minimum emitter ballasting resistance (REmin), which is necessary for SiGe HBT thermal stability, is presented. Furthermore, non-uniform ballasting resistance design is given so as to further enhance the thermal stability of device. It is found that the surface temperature of the device decreases with the increase of Ge composition in SiGe base. This is because SiGe HBT internally possesses the thermal-electrical negative feedback. For the same dissipated power, the REmin decreases as Ge composition increases,which is beneficial to the improvment of the performance of radio frequancy(RF) power SiGe HBT. These results provide a good guide to further optimization of RF power SiGe HBT performance, especially thermal design.关键词
SiGe HBT/Ge组分/热电反馈/镇流电阻Key words
SiGe HBT/ Ge composition/ thermal-electric feedback/ ballasting resistance引用本文复制引用
肖盈,张万荣,金冬月,陈亮,王任卿,谢红云..能带工程对射频功率SiGe异质结双极晶体管热性能的改善[J].物理学报,2011,60(4):310-315,6.基金项目
国家自然科学基金(批准号:60776051),北京市自然科学基金(批准号:4082007),北京市教委科技发展计划(批准号:KM200710005015,KM200910005001)资助的课题. （批准号:60776051）
