采用直接功率注入法，在1 MHz~2 GHz频率范围的传导电磁干扰下，测试获得了低压差线性稳压器的传导电磁抗扰度。针对抗扰度仿真预测，提出了一种以Taylor级数表示的非线性系统和以线性滤波器表示的线性系统的级联模型，同时对于测试系统中分立器件采用传统集**数方法建模，最终实现低压差线性稳压器的传导电磁干扰仿真。仿真结果表明，模型在1 MHz~2 GHz范围内预测的抗扰度和测试数据具有很好的一致性。

This paper used the direct power injection method to obtain the conducted immunity of low-dropout linear regulator (LDO) under electromagnetic interference. And a cascade model of linear filters and Taylor series representation of nonlinear system are proposed for immunity simulation. In addition, the traditional modeling method was used to model the linear device on the test system. Finally the immunity simulation of LDO was carried out and the results show that the model in the 1 MHz-2 GHz range has a good fit between simulation and measurement.