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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Model order reduction of linear and nonlinear 3D thermal finite-element description of microwave devices for circuit analysis
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Model order reduction of linear and nonlinear 3D thermal finite-element description of microwave devices for circuit analysis

机译：用于电路分析的微波设备的线性和非线性3D热有限元描述的模型阶约化

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Electrothermal models of power devices are necessary for the accurate analysis of their performances. For this reason, this article deals with a methodology to obtain an electrothermal model based on a reduced model of a 31) thermal finite-element (FE) description for its thermal part and on pulsed electrical measurements for its electrical part. The reduced thermal model is based on the Ritz vector approach, which ensures a steady-state solution in every case. An equivalent SPICE subcircuit implementation for circuit simulation is proposed and discussed. An extension of the method to a nonlinear reduced model based on the Kirchoff transformation is also proposed. The complete models have been successfully implemented in circuit simulators for several HBT or PHEMT device structures. Many results concerning devices and circuits are presented, including simulation of both the static and dynamic collector-current collapse in HBTs due to the thermal phenomenon. Moreover, the results in terms of the circuit for an X-band high-power amplifier are also presented. As for the nonlinear approach, results concerning an homogeneous structure is given. (c) 2005 Wiley Periodicals, Inc.
机译：功率器件的电热模型对于准确分析其性能是必不可少的。由于这个原因，本文讨论一种方法，该方法基于对热部分的31）热有限元（FE）描述的简化模型以及对电部分的脉冲电测量来获得电热模型。简化的热模型基于Ritz矢量方法，可确保在每种情况下均具有稳态解决方案。提出并讨论了用于电路仿真的等效SPICE子电路实现。还提出了将该方法扩展到基于基尔霍夫变换的非线性简化模型的方法。完整的模型已在几种HBT或PHEMT器件结构的电路仿真器中成功实现。提出了许多有关器件和电路的结果，包括模拟由于热现象导致的HBT中静态和动态集电极电流崩溃。此外，还给出了针对X波段大功率放大器的电路结果。对于非线性方法，给出了有关均匀结构的结果。 （c）2005年Wiley Periodicals，Inc.

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