提出了一种电源/地线网络的快速时域分析方法.本算法在每一模拟时刻,首先离散化原始电路并且利用诺顿定律简化电路,继而针对电路中的链式结构的串联支路,提出了一种无误差的等效电路的模型降阶算法,将原始电路压缩为仅由交叉节点组成的电路.然后用预条件共轭梯度法求解被压缩的电路,最后恢复求解中间节点的电压值.有效地提高了算法的分析效率,在不损失精度的情况下,比目前工业界普遍采用的SPICE软件快两个数量级. A fast time-domain analysis method of power / ground network is proposed.At the beginning of each simulation, the algorithm firstly discretizes the original circuit and uses Norton’s Law to simplify the circuit, and then to the series branches of the chain structure in the circuit An error-free equivalent circuit model reduction algorithm, the original circuit is compressed into a circuit composed of only cross-node. Then preconditioned conjugate gradient method to solve the compressed circuit, and finally restore the intermediate node voltage The efficiency of the algorithm is effectively improved, which is two orders of magnitude faster than the popular SPICE software in the industry without loss of accuracy.