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本文介绍了利用计算机辅助设计Padé逼近法实现SIS结各项电流(ReJ:(w)、ImJ_1(w),ReJ_2(w)及ImJ_2(w))的电模拟。j_1(t)、j_2(t)是实的因果函数,其付里叶变换为J_1(w),J_2(w)。实现计及全部电流的SIS结电模拟的关键就是在给定J_1(w)、J_2(w)的实部与虚部条件下,设计出能同时严格满足其实部与虚部特性曲线形状的滤波器。但是,由于在一般情况下无法写出包含系统零、极点信息的J_1(w)、J_2(w)的解析表示式,用传统的滤波器设计方法也无法实现。利用本文介绍的方法可以实现较高精度的电模拟。
In this paper, we introduce the electrical simulation of various current (ReJ: (w), ImJ_1 (w), ReJ_2 (w) and ImJ_2 (w)) of the SIS junction using the Padé approximation method. j_1 (t), j_2 (t) are real causal functions whose transformations are J_1 (w) and J_2 (w). The key to realizing the SIS junction-taking simulation of all the currents is to design a filter that can satisfy both the real and imaginary part characteristic curves given the real and imaginary parts of J_1 (w) and J_2 (w) Device. However, it is impossible to write the analytical expressions of J_1 (w) and J_2 (w) which contain zero and pole information of the system, and the conventional filter design method can not be realized. Using the method described in this article can achieve more accurate electrical simulation.