Thank you Andrew. Let's still take vcvs as the example. I know that if ns is connected to a reference Vref, the output will be Vref+gain*(p-n). But what if ns is floating? In my spectre simulation, if ns is floating, the output of ps is always 0V and ns is -gain*(p-n). It seems that spectre has some presumption when handling floating node/unknown condition.
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