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如何在Cadence中仿真BUCK的EMI干扰(采用LISN)

请问如何在cadence中利用LISN网络仿真BUCK的EMI干扰呢?我在相关资料中看到了LISN简化模型,如下图所示,尝试按照图示进行仿真。但是当BUCK上功率管导通时,由于阶跃响应,C1瞬间为BUCK供电,则BUCK的输入电压接近于0(大电容串联50Ω电阻到地),从而导致BUCK系统错误。请问应该如何正确仿真EMI呢?非常感谢您的解答!