一种新型全域时域有限差分法

A Novel Global Finite-Difference Time-Domain Method

提出一种基于半导体器件漂移扩散模型并结合交替方向隐式时域有限差分(AD I-FDTD)法的新型全域FDTD法。该方法时间步长的选择取决于数值精度而非稳定性,克服了传统全域FDTD法为了保持数值稳定性,时间步长的选取受限于Courant稳定性条件的问题。该方法的复杂度稍微增加,但是通过增加时间步长,减少计算时间、提高计算速度。该方法的主要特点是模拟一个简单的二极管分布开关电路。

A novel global FDTD scheme based on a drift-diffuse model of semiconductor combined alternating direction implicit finite-difference time-domain (ADI-FDTD) method is presented in this paper. The method overcomes the problem of selecting time increment limited to Courant stability condition by keeping the numerical stability. The time increment of the proposed method is determined by numerical precision not by stability. Although the proposed method has a little more complicated structure, it can reduce computation time, improve computation speed by increasing time increment. Main features of the method are described by means of the simulation of a simple circuit of distributed diode switch.