在片传输线等效电路模型的传递函数分析

提出了一种通过传递函数分析来确定在片传输线等效电路模型拓扑结构的新方法。通过这种方法,可分析得出由不同1-π单元组成的等效电路的拟合能力。通过对测量S参数的有理逼近构建了一个宽带宏模型。通过对比等效电路模型与宏模型的传递函数的零点和极点,开发出一种可靠且高效的确定传递函数等效电路结构的方法。分析发现复极点决定了模型的宽带拟合能力。共面传输线到50 GHz的测量S参数证明了本文提出的方法非常有助于寻找满足精度要求且最简单的拓扑。

Transfer Function Analysis for the Equivalent Circuit Model of on-Chip Transmission Lines

A novel method to determine the topology of the equivalent circuit model of the on-chip transmission line by transfer function analysis was presented.The fitting capacities of the equivalent circuits with different number of 1-π segments were clearly evaluated through the calculation of their transfer functions.A broadband macromodel was proposed by rational approximation of measured S-parameters.By comparing the zeros and poles of the transfer functions of the equivalent circuit model and macromodel,a reliable and efficient method for choosing the model topology for transmission lines was developed.It is found that the complex poles are responsible for the broadband fitting capacity of the model.Measured S-parameters of a coplanar waveguide(CPW) transmission line up to 50 GHz have verified that the proposed method is quite helpful in finding the simplest topology with sufficient accuracy.