Characterization of Linearity and Thermal Stability of HBT'sfor Optimum Performance

9629643 Prasad本研究项目的主要目标是异质结双极晶体管（HBT）的线性和热稳定性表征，以获得最佳性能。 实验将使用由工业合作者提供的不同几何形状和材料系统的几个设备进行。 一个初步的调查，导致在一个大信号模型的反（集电极向上）HBT的谐波失真分析的发展。 该模型将用于使用不同的方法（例如Maas的沃尔泰拉级数方法和Filicori的非线性积分方法）来对互调失真进行建模。 分析和数值方法也提出了发展的互调失真建模。 应调查功率效率，并确定最有效运行的最佳条件。 特别是，最大功率，该设备可以进行有效的操作在一定范围内的偏置电平将被测量。 HBT的线性度和热稳定性的应用特定优化应该是本研究项目的结果。 如果成功，同样的方法可以应用于其他应用程序的优化。 ***

9629643 Prasad The major objective of this research project is the linearity and thermal stability characterization of the heterojunction biopolar transistor (HBT) for optimum performance. Experiments are to be performed using several devices of different geometries and material systems to be provided by the industrial collaborators. A preliminary investigation has resulted in the development of a large signal model of the inverted (collector-up) HBT for harmonic distortion analysis. This model is to be used to model intermodulation distortion using different methods such as Volterra series method of Maas and the nonlinear integral method of Filicori. Analytical and numerical methods are also proposed to be developed for the intermodulation distortion modelling. Power efficiency is to be investigated and optimum conditions for the most efficient operation are to be determined. In particular, the maximum power that the device can carry for efficient operation over a range of bias levels will be measured. Application specific optimization of the HBT for linearity and thermal stability should be the result of this research project. If successful, the same methods could be applied for the optimization of other applications. ***