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微波非线性电路建模方法的研究
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摘要
众所周知,微波功率放大器是工作在大信号状态下,呈现非线性特性,为了进行微波功率放大器的最优设计,必须建立精确的大信号非线性电路和元件模型。本文主要的研究内容是对从小信号建模为基础进行大功率晶体管非线性建模。目的是最终建立GaAsFET大信号非线性电路模型。
     本文主要对GaAsFET建模方法进行了学习和研究,提出了一种电路提取S参数的测试方法。在已经建立了小信号模型的基础上,通过测量GaAsFET的I-V特性,精确完成GaAsFET大信号非线性模型的建立。建模完成后用谐波平衡法进行分析,验证了模型能够准确的描述晶体管的大信号特性。在总结传统非线性表征方法的前提下,为了弥补不足,提出一种新的非线性表征方法——非线性散射函数,并对其性质进行了讨论。
It is known to us all that microwave power amplifiers under large-signal condition present behaviors with nonlinearity. In order to optimize the microwave power amplifiers, we must construct large-signal nonlinear cicuits and device models. The goal of this paper is to implement the nonlinear modeling of power GaAs FET based on the small-signal model.
     In order to compensate the traditional nonlinear characteristics, the new method of depicting nonlinearity, nonlinear scattering function, is brought up; meanwhile its characteristics are discussed. After researching on the method of modeling GaAs FET, we introduce a circuital mothod of extracting S parameters. Relied on the existed small-signal model, large-signal nonlinear model of GaAs FET is then constructed via the measurements of I-V curves of GaAs FET. Finally we validate that this model can be used to describe the large-signal characteristics of power transistors with harmonic balance method.
引文
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