高手请围观过来~~~

小弟最近在仿真TSMC45nm的标准I/O.主要是一些level shift 电路,将低电平，上升到高电平。文档中提到了标准I/O的一个指标”simultaneously Switching Noise(SSN)“.SSN means the noise produced by the simultaneously switching output buffers. it would change the voltage levels of power /ground nodes, so-called "Ground Bounce Effect". Ground Bounce Effect is tested at the device output by keeping one stable output at low "0",or high "1",while all other outputs of the device switch simultaneously. The noise occurred at the stable output node is called "Quiet Output Switching(QOS)". if the input low voltage is defined as Vil, the QOS of Vil is taken to be the maximum noise that the system can endure.
请问这里面的SSN，或者QOS 怎样仿真呢?

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