摘要 : The problem of calculating parasitic capacitances is investigated with the main focus put on how to derive the approximate expressions of the capacitances caused at intersections and parallel runs of interconnects. To derive a sim... 展开 The problem of calculating parasitic capacitances is investigated with the main focus put on how to derive the approximate expressions of the capacitances caused at intersections and parallel runs of interconnects. To derive a simple and accurate approximate expression, the interconnects are divided into a few basic coupling regions, in such a way that the electro-magnetic field in each region can be calculated by a 2-D capacitance model. Then the capacitance in such a region is represented by a simple expression adjusted to the results computed by an electro-magnetic field solver. The total capacitance attained by summing the capacitances of these regions proves to be approximated within a relative error of 5% as compared with that obtained by using a 3-D field solver. 收起