用NILT导出的传输线瞬态分析模型

K Singhal与J Vlach的NILT(数值Laplace反变换) 技术是端接线性负载传输线分析的一种有效方法.本文利用这一NILT技术,导出了传输线的时域离散模型,由此可进行端接任意负载传输线的瞬态分析.这一模型毋须象通常的频域方法那样对传输线作有理逼近,因而不存在由此带来的数值问题,而计算量与它们相当.文中分别给出了均匀与非均匀传输线的处理,并用实例作了验证.

Transmission Line Model for Transient Simulation Derived Using the NILT Technique

K Singhal & J Vlach's NILT(Numerical Inversion of Laplace Transform) method is an efficient approach to the transient analysis of lossy transmission lines terminated with linear loads.This technique is utilized in this paper to derive a discrete time model for transmission lines.The model thus obtained can be easily implemented in general circuit simulators,so that the transient simulation for arbitrary loaded transmission lines can be readily accomplished.Unlike the prevailing frequency domain methods employing the moment matching technique,no rational approximation is required in this method and numerical problems thus aroused such as stability and preserving of the passivity are avoided.Both uniform and nonuniform lines are dealt with.Numerical experiments carried out by implementing the model into the circuit simulator SPICE have been performed and the results demonstrate the validity and efficiency of the method.